diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3549a766c0..b5e5b419b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Added
 
-- Nothing yet.
+- Methods to get style for row or column. [PR #4317](https://github.com/PHPOffice/PhpSpreadsheet/pull/4317)
+- Method for duplicating worksheet in spreadsheet. [PR #4315](https://github.com/PHPOffice/PhpSpreadsheet/pull/4315)
 
 ### Changed
 
@@ -25,7 +26,10 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
-- Nothing yet.
+- Ods Reader Sheet Names with Period. [Issue #4311](https://github.com/PHPOffice/PhpSpreadsheet/issues/4311) [PR #4313](https://github.com/PHPOffice/PhpSpreadsheet/pull/4313)
+- Mpdf and Tcpdf Hidden Columns and Merged Cells. [Issue #4319](https://github.com/PHPOffice/PhpSpreadsheet/issues/4319) [PR #4320](https://github.com/PHPOffice/PhpSpreadsheet/pull/4320)
+- Html Writer Allow mailto. [Issue #4316](https://github.com/PHPOffice/PhpSpreadsheet/issues/4316) [PR #4322](https://github.com/PHPOffice/PhpSpreadsheet/pull/4322)
+- Use composer/pcre rather than preg_* in Writer. [PR #4323](https://github.com/PHPOffice/PhpSpreadsheet/pull/4323)
 
 ## 2025-01-11 - 3.8.0
 
diff --git a/composer.json b/composer.json
index 7f1777676c..22d22c1a67 100644
--- a/composer.json
+++ b/composer.json
@@ -79,6 +79,7 @@
         "ext-xmlwriter": "*",
         "ext-zip": "*",
         "ext-zlib": "*",
+        "composer/pcre": "^3.3",
         "maennchen/zipstream-php": "^2.1 || ^3.0",
         "markbaker/complex": "^3.0",
         "markbaker/matrix": "^3.0",
diff --git a/composer.lock b/composer.lock
index cc706e608e..ee9da8ac4f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,87 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f7caa2101e268445a358275ee83b90d9",
+    "content-hash": "264ef911bd6d773a3a9085bc86b0ea48",
     "packages": [
+        {
+            "name": "composer/pcre",
+            "version": "3.3.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/pcre.git",
+                "reference": "b2bed4734f0cc156ee1fe9c0da2550420d99a21e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/pcre/zipball/b2bed4734f0cc156ee1fe9c0da2550420d99a21e",
+                "reference": "b2bed4734f0cc156ee1fe9c0da2550420d99a21e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<1.11.10"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.12 || ^2",
+                "phpstan/phpstan-strict-rules": "^1 || ^2",
+                "phpunit/phpunit": "^8 || ^9"
+            },
+            "type": "library",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "extension.neon"
+                    ]
+                },
+                "branch-alias": {
+                    "dev-main": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Pcre\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
+            "keywords": [
+                "PCRE",
+                "preg",
+                "regex",
+                "regular expression"
+            ],
+            "support": {
+                "issues": "https://github.com/composer/pcre/issues",
+                "source": "https://github.com/composer/pcre/tree/3.3.2"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-11-12T16:29:46+00:00"
+        },
         {
             "name": "maennchen/zipstream-php",
             "version": "3.1.1",
@@ -467,85 +546,6 @@
             ],
             "time": "2022-12-23T10:58:28+00:00"
         },
-        {
-            "name": "composer/pcre",
-            "version": "3.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/composer/pcre.git",
-                "reference": "ea4ab6f9580a4fd221e0418f2c357cdd39102a90"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/composer/pcre/zipball/ea4ab6f9580a4fd221e0418f2c357cdd39102a90",
-                "reference": "ea4ab6f9580a4fd221e0418f2c357cdd39102a90",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.4 || ^8.0"
-            },
-            "conflict": {
-                "phpstan/phpstan": "<1.11.8"
-            },
-            "require-dev": {
-                "phpstan/phpstan": "^1.11.8",
-                "phpstan/phpstan-strict-rules": "^1.1",
-                "phpunit/phpunit": "^8 || ^9"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "3.x-dev"
-                },
-                "phpstan": {
-                    "includes": [
-                        "extension.neon"
-                    ]
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Composer\\Pcre\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Jordi Boggiano",
-                    "email": "j.boggiano@seld.be",
-                    "homepage": "http://seld.be"
-                }
-            ],
-            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
-            "keywords": [
-                "PCRE",
-                "preg",
-                "regex",
-                "regular expression"
-            ],
-            "support": {
-                "issues": "https://github.com/composer/pcre/issues",
-                "source": "https://github.com/composer/pcre/tree/3.2.0"
-            },
-            "funding": [
-                {
-                    "url": "https://packagist.com",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/composer",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-07-25T09:36:02+00:00"
-        },
         {
             "name": "composer/semver",
             "version": "3.4.2",
diff --git a/docs/topics/recipes.md b/docs/topics/recipes.md
index d70d3a97b3..e2d9f58628 100644
--- a/docs/topics/recipes.md
+++ b/docs/topics/recipes.md
@@ -926,6 +926,7 @@ loop. This is much faster compared to looping through cells and styling
 them individually.
 
 **Tip** If you are styling entire row(s) or column(s), e.g. getStyle('A:A'), it is recommended to use applyFromArray as described below rather than setting the styles individually as described above.
+Also, starting with release 3.9.0, you should use getRowStyle or getColumnStyle to get the style for an entire row or column.
 
 There is also an alternative manner to set styles. The following code
 sets a cell's style to font bold, alignment right, top border thin and a
diff --git a/docs/topics/worksheets.md b/docs/topics/worksheets.md
index 0199f13c6a..5b15089b61 100644
--- a/docs/topics/worksheets.md
+++ b/docs/topics/worksheets.md
@@ -95,19 +95,38 @@ insert the clone into the workbook.
 
 ```php
 $clonedWorksheet = clone $spreadsheet->getSheetByName('Worksheet 1');
-$clonedWorksheet->setTitle('Copy of Worksheet 1');
+$clonedWorksheet->setTitle('Copy of Worksheet 1'); // must be unique
 $spreadsheet->addSheet($clonedWorksheet);
 ```
+Starting with PhpSpreadsheet 3.9.0, this can be done more simply (copied sheet's title will be set to something unique):
+```php
+$copiedWorksheet = $spreadsheet->duplicateWorksheetByTitle('sheetname');
+```
 
 You can also copy worksheets from one workbook to another, though this
 is more complex as PhpSpreadsheet also has to replicate the styling
 between the two workbooks. The `addExternalSheet()` method is provided for
 this purpose.
 
-    $clonedWorksheet = clone $spreadsheet1->getSheetByName('Worksheet 1');
-    $spreadsheet->addExternalSheet($clonedWorksheet);
+```php
+$clonedWorksheet = clone $spreadsheet1->getSheetByName('Worksheet 1');
+$clonedWorksheet->setTitle('Copy of Worksheet 1'); // must be unique
+$spreadsheet1->addSheet($clonedWorksheet);
+$spreadsheet->addExternalSheet($clonedWorksheet);
+```
+Starting with PhpSpreadsheet 3.8.0, this can be simplified:
+```php
+$clonedWorksheet = clone $spreadsheet1->getSheetByName('Worksheet 1');
+$spreadsheet1->addSheet($clonedWorksheet, null, true);
+$spreadsheet->addExternalSheet($clonedWorksheet);
+```
+Starting with PhpSpreadsheet 3.9.0, this can be simplified even further:
+```php
+$clonedWorksheet = $spreadsheet1->duplicateWorksheetByTitle('sheetname');
+$spreadsheet->addExternalSheet($clonedWorksheet);
+```
 
-In both cases, it is the developer's responsibility to ensure that
+In the cases commented "must be unique", it is the developer's responsibility to ensure that
 worksheet names are not duplicated. PhpSpreadsheet will throw an
 exception if you attempt to copy worksheets that will result in a
 duplicate name.
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 06fbbcdd66..e34d429456 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -2,6 +2,7 @@ includes:
     - phpstan-baseline.neon
     - vendor/phpstan/phpstan-phpunit/extension.neon
     - vendor/phpstan/phpstan-phpunit/rules.neon
+    - vendor/composer/pcre/extension.neon
 
 parameters:
     level: 8
diff --git a/samples/Pdf/21b_Pdf.php b/samples/Pdf/21b_Pdf.php
index 38ba4d9c45..e9d3402590 100644
--- a/samples/Pdf/21b_Pdf.php
+++ b/samples/Pdf/21b_Pdf.php
@@ -1,5 +1,6 @@
 <?php
 
+use PhpOffice\PhpSpreadsheet\Exception as SpreadsheetException;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
 use PhpOffice\PhpSpreadsheet\Writer\Pdf\Dompdf;
@@ -21,7 +22,7 @@ function replaceBody(string $html): string
         </body>
         EOF;
 
-    return preg_replace($bodystring, $bodyrepl, $html) ?? '';
+    return preg_replace($bodystring, $bodyrepl, $html) ?? throw new SpreadsheetException('preg failed');
 }
 
 require __DIR__ . '/../Header.php';
diff --git a/samples/Pdf/21c_Pdf.php b/samples/Pdf/21c_Pdf.php
index 5a6a26d379..66d964aedd 100644
--- a/samples/Pdf/21c_Pdf.php
+++ b/samples/Pdf/21c_Pdf.php
@@ -1,5 +1,6 @@
 <?php
 
+use PhpOffice\PhpSpreadsheet\Exception as SpreadsheetException;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Writer\Pdf\Mpdf;
@@ -16,7 +17,7 @@ function addHeadersFootersMpdf2000(string $html): string
         odd-footer-name: html_myFooter2;
 
         EOF;
-    $html = preg_replace('/@page page0 {/', $pagerepl, $html) ?? '';
+    $html = preg_replace('/@page page0 {/', $pagerepl, $html) ?? throw new SpreadsheetException('preg 1 failed');
     $bodystring = '/<body>/';
     $simulatedBodyStart = Mpdf::SIMULATED_BODY_START;
     $bodyrepl = <<<EOF
@@ -40,7 +41,7 @@ function addHeadersFootersMpdf2000(string $html): string
 
         EOF;
 
-    return preg_replace($bodystring, $bodyrepl, $html) ?? '';
+    return preg_replace($bodystring, $bodyrepl, $html) ?? throw new SpreadsheetException('preg 2 failed');
 }
 
 $spreadsheet = new Spreadsheet();
diff --git a/samples/Reading_workbook_data/Custom_properties.php b/samples/Reading_workbook_data/Custom_properties.php
index 26f7c33d06..1a84e73f2d 100644
--- a/samples/Reading_workbook_data/Custom_properties.php
+++ b/samples/Reading_workbook_data/Custom_properties.php
@@ -38,7 +38,7 @@
 
             break;
         case 'd':    // date
-            $propertyValue = is_numeric($propertyValue) ? date('l, d<\s\u\p>S</\s\u\p> F Y g:i A', (int) $propertyValue) : '*****INVALID*****';
+            $propertyValue = is_numeric($propertyValue) ? date('l, j<\s\u\p>S</\s\u\p> F Y g:i A', (int) $propertyValue) : '*****INVALID*****';
             $propertyType = 'date';
 
             break;
diff --git a/samples/Reading_workbook_data/Properties.php b/samples/Reading_workbook_data/Properties.php
index a24a4967a8..441b12c9a5 100644
--- a/samples/Reading_workbook_data/Properties.php
+++ b/samples/Reading_workbook_data/Properties.php
@@ -19,7 +19,7 @@
 
 // Read the Date when the workbook was created (as a PHP timestamp value)
 $creationDatestamp = $spreadsheet->getProperties()->getCreated();
-$creationDate = Date::formattedDateTimeFromTimestamp("$creationDatestamp", 'l, d<\s\up>S</\s\up> F Y');
+$creationDate = Date::formattedDateTimeFromTimestamp("$creationDatestamp", 'l, j<\s\u\p>S</\s\u\p> F Y');
 $creationTime = Date::formattedDateTimeFromTimestamp("$creationDatestamp", 'g:i A');
 $helper->log('<b>Created On: </b>' . $creationDate . ' at ' . $creationTime);
 
@@ -30,7 +30,7 @@
 // Read the Date when the workbook was last modified (as a PHP timestamp value)
 $modifiedDatestamp = $spreadsheet->getProperties()->getModified();
 // Format the date and time using the standard PHP date() function
-$modifiedDate = Date::formattedDateTimeFromTimestamp("$modifiedDatestamp", 'l, d<\s\up>S</\s\up> F Y');
+$modifiedDate = Date::formattedDateTimeFromTimestamp("$modifiedDatestamp", 'l, j<\s\u\p>S</\s\u\p> F Y');
 $modifiedTime = Date::formattedDateTimeFromTimestamp("$modifiedDatestamp", 'g:i A');
 $helper->log('<b>Last Modified On: </b>' . $modifiedDate . ' at ' . $modifiedTime);
 
diff --git a/src/PhpSpreadsheet/Reader/Ods/FormulaTranslator.php b/src/PhpSpreadsheet/Reader/Ods/FormulaTranslator.php
index 27862d7a5a..6e54e0039e 100644
--- a/src/PhpSpreadsheet/Reader/Ods/FormulaTranslator.php
+++ b/src/PhpSpreadsheet/Reader/Ods/FormulaTranslator.php
@@ -6,10 +6,24 @@
 
 class FormulaTranslator
 {
-    public static function convertToExcelAddressValue(string $openOfficeAddress): string
+    private static function replaceQuotedPeriod(string $value): string
     {
-        $excelAddress = $openOfficeAddress;
+        $value2 = '';
+        $quoted = false;
+        foreach (mb_str_split($value, 1, 'UTF-8') as $char) {
+            if ($char === "'") {
+                $quoted = !$quoted;
+            } elseif ($char === '.' && $quoted) {
+                $char = "\u{fffe}";
+            }
+            $value2 .= $char;
+        }
 
+        return $value2;
+    }
+
+    public static function convertToExcelAddressValue(string $openOfficeAddress): string
+    {
         // Cell range 3-d reference
         // As we don't support 3-d ranges, we're just going to take a quick and dirty approach
         //  and assume that the second worksheet reference is the same as the first
@@ -20,6 +34,7 @@ public static function convertToExcelAddressValue(string $openOfficeAddress): st
                 '/\$?([^\.]+)\.([^\.]+)/miu', // Cell reference in another sheet
                 '/\.([^\.]+):\.([^\.]+)/miu', // Cell range reference
                 '/\.([^\.]+)/miu', // Simple cell reference
+                '/\\x{FFFE}/miu', // restore quoted periods
             ],
             [
                 '$1!$2:$4',
@@ -27,8 +42,9 @@ public static function convertToExcelAddressValue(string $openOfficeAddress): st
                 '$1!$2',
                 '$1:$2',
                 '$1',
+                '.',
             ],
-            $excelAddress
+            self::replaceQuotedPeriod($openOfficeAddress)
         );
 
         return $excelAddress;
@@ -52,14 +68,16 @@ public static function convertToExcelFormulaValue(string $openOfficeFormula): st
                         '/\[\$?([^\.]+)\.([^\.]+)\]/miu', // Cell reference in another sheet
                         '/\[\.([^\.]+):\.([^\.]+)\]/miu', // Cell range reference
                         '/\[\.([^\.]+)\]/miu', // Simple cell reference
+                        '/\\x{FFFE}/miu', // restore quoted periods
                     ],
                     [
                         '$1!$2:$3',
                         '$1!$2',
                         '$1:$2',
                         '$1',
+                        '.',
                     ],
-                    $value
+                    self::replaceQuotedPeriod($value)
                 );
                 // Convert references to defined names/formulae
                 $value = str_replace('$$', '', $value);
diff --git a/src/PhpSpreadsheet/Shared/StringHelper.php b/src/PhpSpreadsheet/Shared/StringHelper.php
index a16b1cafc0..73bb057dfb 100644
--- a/src/PhpSpreadsheet/Shared/StringHelper.php
+++ b/src/PhpSpreadsheet/Shared/StringHelper.php
@@ -638,4 +638,9 @@ public static function testStringAsNumeric(string $textValue): float|string
 
         return (is_numeric(substr($textValue, 0, strlen((string) $v)))) ? $v : $textValue;
     }
+
+    public static function strlenAllowNull(?string $string): int
+    {
+        return strlen("$string");
+    }
 }
diff --git a/src/PhpSpreadsheet/Spreadsheet.php b/src/PhpSpreadsheet/Spreadsheet.php
index f40a8889ac..86f9d891ea 100644
--- a/src/PhpSpreadsheet/Spreadsheet.php
+++ b/src/PhpSpreadsheet/Spreadsheet.php
@@ -529,6 +529,15 @@ public function sheetNameExists(string $worksheetName): bool
         return $this->getSheetByName($worksheetName) !== null;
     }
 
+    public function duplicateWorksheetByTitle(string $title): Worksheet
+    {
+        $original = $this->getSheetByNameOrThrow($title);
+        $index = $this->getIndex($original) + 1;
+        $clone = clone $original;
+
+        return $this->addSheet($clone, $index, true);
+    }
+
     /**
      * Add sheet.
      *
@@ -1092,6 +1101,11 @@ public function getCellXfByIndex(int $cellStyleIndex): Style
         return $this->cellXfCollection[$cellStyleIndex];
     }
 
+    public function getCellXfByIndexOrNull(?int $cellStyleIndex): ?Style
+    {
+        return ($cellStyleIndex === null) ? null : ($this->cellXfCollection[$cellStyleIndex] ?? null);
+    }
+
     /**
      * Get cellXf by hash code.
      *
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index e06c81e7c5..33e6e465f5 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -1336,6 +1336,13 @@ public function getRowDimension(int $row): RowDimension
         return $this->rowDimensions[$row];
     }
 
+    public function getRowStyle(int $row): ?Style
+    {
+        return $this->parent?->getCellXfByIndexOrNull(
+            ($this->rowDimensions[$row] ?? null)?->getXfIndex()
+        );
+    }
+
     public function rowDimensionExists(int $row): bool
     {
         return isset($this->rowDimensions[$row]);
@@ -1379,6 +1386,13 @@ public function getColumnDimensionByColumn(int $columnIndex): ColumnDimension
         return $this->getColumnDimension(Coordinate::stringFromColumnIndex($columnIndex));
     }
 
+    public function getColumnStyle(string $column): ?Style
+    {
+        return $this->parent?->getCellXfByIndexOrNull(
+            ($this->columnDimensions[$column] ?? null)?->getXfIndex()
+        );
+    }
+
     /**
      * Get styles.
      *
diff --git a/src/PhpSpreadsheet/Writer/Html.php b/src/PhpSpreadsheet/Writer/Html.php
index 48e8450352..3f4af3e325 100644
--- a/src/PhpSpreadsheet/Writer/Html.php
+++ b/src/PhpSpreadsheet/Writer/Html.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
@@ -646,13 +647,13 @@ private function writeImageInCell(string $coordinates): string
                 $filename = $drawing->getPath();
 
                 // Strip off eventual '.'
-                $filename = (string) preg_replace('/^[.]/', '', $filename);
+                $filename = Preg::replace('/^[.]/', '', $filename);
 
                 // Prepend images root
                 $filename = $this->getImagesRoot() . $filename;
 
                 // Strip off eventual '.' if followed by non-/
-                $filename = (string) preg_replace('@^[.]([^/])@', '$1', $filename);
+                $filename = Preg::replace('@^[.]([^/])@', '$1', $filename);
 
                 // Convert UTF8 data to PCDATA
                 $filename = htmlspecialchars($filename, Settings::htmlEntityFlags());
@@ -1411,7 +1412,7 @@ private function generateRowCellData(Worksheet $worksheet, null|Cell|string $cel
 
             // Converts the cell content so that spaces occuring at beginning of each new line are replaced by &nbsp;
             // Example: "  Hello\n to the world" is converted to "&nbsp;&nbsp;Hello\n&nbsp;to the world"
-            $cellData = (string) preg_replace('/(?m)(?:^|\\G) /', '&nbsp;', $cellData);
+            $cellData = Preg::replace('/(?m)(?:^|\\G) /', '&nbsp;', $cellData);
 
             // convert newline "\n" to '<br>'
             $cellData = nl2br($cellData);
@@ -1565,7 +1566,7 @@ private function generateRowWriteCell(
     /**
      * Generate row.
      *
-     * @param array $values Array containing cells in a row
+     * @param array<int, mixed> $values Array containing cells in a row
      * @param int $row Row number (0-based)
      * @param string $cellType eg: 'td'
      */
@@ -1577,7 +1578,19 @@ private function generateRow(Worksheet $worksheet, array $values, int $row, stri
 
         // Write cells
         $colNum = 0;
-        foreach ($values as $cellAddress) {
+        $tcpdfInited = false;
+        foreach ($values as $key => $cellAddress) {
+            if ($this instanceof Pdf\Mpdf) {
+                $colNum = $key - 1;
+            } elseif ($this instanceof Pdf\Tcpdf) {
+                // It appears that Tcpdf requires first cell in tr.
+                $colNum = $key - 1;
+                if (!$tcpdfInited && $key !== 1) {
+                    $tempspan = ($colNum > 1) ? " colspan='$colNum'" : '';
+                    $html .= "<td$tempspan></td>\n";
+                }
+                $tcpdfInited = true;
+            }
             [$cell, $cssClass, $coordinate] = $this->generateRowCellCss($worksheet, $cellAddress, $row, $colNum);
 
             // Cell Data
@@ -1587,12 +1600,17 @@ private function generateRow(Worksheet $worksheet, array $values, int $row, stri
             if ($worksheet->hyperlinkExists($coordinate) && !$worksheet->getHyperlink($coordinate)->isInternal()) {
                 $url = $worksheet->getHyperlink($coordinate)->getUrl();
                 $urlDecode1 = html_entity_decode($url, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
-                $urlTrim = preg_replace('/^\\s+/u', '', $urlDecode1) ?? $urlDecode1;
-                $parseScheme = preg_match('/^([\\w\\s]+):/u', strtolower($urlTrim), $matches);
-                if ($parseScheme === 1 && !in_array($matches[1], ['http', 'https', 'file', 'ftp', 's3'], true)) {
+                $urlTrim = Preg::replace('/^\\s+/u', '', $urlDecode1);
+                $parseScheme = Preg::isMatch('/^([\\w\\s]+):/u', strtolower($urlTrim), $matches);
+                if ($parseScheme && !in_array($matches[1], ['http', 'https', 'file', 'ftp', 'mailto', 's3'], true)) {
                     $cellData = htmlspecialchars($url, Settings::htmlEntityFlags());
                 } else {
-                    $cellData = '<a href="' . htmlspecialchars($url, Settings::htmlEntityFlags()) . '" title="' . htmlspecialchars($worksheet->getHyperlink($coordinate)->getTooltip(), Settings::htmlEntityFlags()) . '">' . $cellData . '</a>';
+                    $tooltip = $worksheet->getHyperlink($coordinate)->getTooltip();
+                    $tooltipOut = empty($tooltip) ? '' : (' title="' . htmlspecialchars($tooltip) . '"');
+                    $cellData = '<a href="'
+                        . htmlspecialchars($url) . '"'
+                        . $tooltipOut
+                        . '>' . $cellData . '</a>';
                 }
             }
 
@@ -1738,7 +1756,7 @@ public static function formatColorStatic(string $value, string $format): string
         $matches = [];
 
         $color_regex = '/^\\[[a-zA-Z]+\\]/';
-        if (preg_match($color_regex, $format, $matches)) {
+        if (Preg::isMatch($color_regex, $format, $matches)) {
             $color = str_replace(['[', ']'], '', $matches[0]);
             $color = strtolower($color);
         }
diff --git a/src/PhpSpreadsheet/Writer/Ods/Content.php b/src/PhpSpreadsheet/Writer/Ods/Content.php
index 3b9cc82458..1c87385c57 100644
--- a/src/PhpSpreadsheet/Writer/Ods/Content.php
+++ b/src/PhpSpreadsheet/Writer/Ods/Content.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Ods;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Calculation\Exception as CalculationException;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
@@ -227,16 +228,15 @@ private function writeCells(XMLWriter $objWriter, RowCellIterator $cells): void
                         }
                     }
                     if (isset($attributes['ref'])) {
-                        if (preg_match('/^([A-Z]{1,3})([0-9]{1,7})(:([A-Z]{1,3})([0-9]{1,7}))?$/', (string) $attributes['ref'], $matches) == 1) {
+                        if (Preg::isMatch('/^([A-Z]{1,3})([0-9]{1,7})(:([A-Z]{1,3})([0-9]{1,7}))?$/', (string) $attributes['ref'], $matches)) {
                             $matrixRowSpan = 1;
                             $matrixColSpan = 1;
                             if (isset($matches[3])) {
                                 $minRow = (int) $matches[2];
-                                // https://github.com/phpstan/phpstan/issues/11602
-                                $maxRow = (int) $matches[5]; // @phpstan-ignore-line
+                                $maxRow = (int) $matches[5];
                                 $matrixRowSpan = $maxRow - $minRow + 1;
                                 $minCol = Coordinate::columnIndexFromString($matches[1]);
-                                $maxCol = Coordinate::columnIndexFromString($matches[4]); // @phpstan-ignore-line
+                                $maxCol = Coordinate::columnIndexFromString($matches[4]);
                                 $matrixColSpan = $maxCol - $minCol + 1;
                             }
                             $objWriter->writeAttribute('table:number-matrix-columns-spanned', "$matrixColSpan");
diff --git a/src/PhpSpreadsheet/Writer/Ods/Formula.php b/src/PhpSpreadsheet/Writer/Ods/Formula.php
index 335df56dd6..4a874c7b15 100644
--- a/src/PhpSpreadsheet/Writer/Ods/Formula.php
+++ b/src/PhpSpreadsheet/Writer/Ods/Formula.php
@@ -2,8 +2,10 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Ods;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\DefinedName;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 
 class Formula
 {
@@ -33,14 +35,13 @@ public function convertFormula(string $formula, string $worksheetName = ''): str
 
     private function convertDefinedNames(string $formula): string
     {
-        $splitCount = preg_match_all(
+        $splitCount = Preg::matchAllWithOffsets(
             '/' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '/mui',
             $formula,
-            $splitRanges,
-            PREG_OFFSET_CAPTURE
+            $splitRanges
         );
 
-        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
+        $lengths = array_map([StringHelper::class, 'strlenAllowNull'], array_column($splitRanges[0], 0));
         $offsets = array_column($splitRanges[0], 1);
         $values = array_column($splitRanges[0], 0);
 
@@ -60,14 +61,13 @@ private function convertDefinedNames(string $formula): string
 
     private function convertCellReferences(string $formula, string $worksheetName): string
     {
-        $splitCount = preg_match_all(
+        $splitCount = Preg::matchAllWithOffsets(
             '/' . Calculation::CALCULATION_REGEXP_CELLREF_RELATIVE . '/mui',
             $formula,
-            $splitRanges,
-            PREG_OFFSET_CAPTURE
+            $splitRanges
         );
 
-        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
+        $lengths = array_map([StringHelper::class, 'strlenAllowNull'], array_column($splitRanges[0], 0));
         $offsets = array_column($splitRanges[0], 1);
 
         $worksheets = $splitRanges[2];
@@ -76,7 +76,7 @@ private function convertCellReferences(string $formula, string $worksheetName):
 
         // Replace any commas in the formula with semi-colons for Ods
         // If by chance there are commas in worksheet names, then they will be "fixed" again in the loop
-        //    because we've already extracted worksheet names with our preg_match_all()
+        //    because we've already extracted worksheet names with our Preg::matchAllWithOffsets()
         $formula = str_replace(',', ';', $formula);
         while ($splitCount > 0) {
             --$splitCount;
diff --git a/src/PhpSpreadsheet/Writer/Ods/NamedExpressions.php b/src/PhpSpreadsheet/Writer/Ods/NamedExpressions.php
index 0fda160f31..3e622f20d2 100644
--- a/src/PhpSpreadsheet/Writer/Ods/NamedExpressions.php
+++ b/src/PhpSpreadsheet/Writer/Ods/NamedExpressions.php
@@ -2,8 +2,10 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Ods;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\DefinedName;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Shared\XMLWriter;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
@@ -80,14 +82,13 @@ private function writeNamedRange(DefinedName $definedName): void
 
     private function convertAddress(DefinedName $definedName, string $address): string
     {
-        $splitCount = preg_match_all(
+        $splitCount = Preg::matchAllWithOffsets(
             '/' . Calculation::CALCULATION_REGEXP_CELLREF_RELATIVE . '/mui',
             $address,
-            $splitRanges,
-            PREG_OFFSET_CAPTURE
+            $splitRanges
         );
 
-        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
+        $lengths = array_map([StringHelper::class, 'strlenAllowNull'], array_column($splitRanges[0], 0));
         $offsets = array_column($splitRanges[0], 1);
 
         $worksheets = $splitRanges[2];
diff --git a/src/PhpSpreadsheet/Writer/Ods/Settings.php b/src/PhpSpreadsheet/Writer/Ods/Settings.php
index cfe1b598d9..695c604784 100644
--- a/src/PhpSpreadsheet/Writer/Ods/Settings.php
+++ b/src/PhpSpreadsheet/Writer/Ods/Settings.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Ods;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Cell\CellAddress;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Shared\XMLWriter;
@@ -97,7 +98,7 @@ private function writeWorksheetSettings(XMLWriter $objWriter, Worksheet $workshe
     private function writeSelectedCells(XMLWriter $objWriter, Worksheet $worksheet): void
     {
         $selected = $worksheet->getSelectedCells();
-        if (preg_match('/^([a-z]+)([0-9]+)/i', $selected, $matches) === 1) {
+        if (Preg::isMatch('/^([a-z]+)([0-9]+)/i', $selected, $matches)) {
             $colSel = Coordinate::columnIndexFromString($matches[1]) - 1;
             $rowSel = (int) $matches[2] - 1;
             $objWriter->startElement('config:config-item');
diff --git a/src/PhpSpreadsheet/Writer/Xls/Parser.php b/src/PhpSpreadsheet/Writer/Xls/Parser.php
index 422492d4e8..52b4ad3538 100644
--- a/src/PhpSpreadsheet/Writer/Xls/Parser.php
+++ b/src/PhpSpreadsheet/Writer/Xls/Parser.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xls;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
@@ -45,7 +46,26 @@ class Parser
     // Invalid sheet title characters cannot occur in the sheet title:
     // *:/\?[]                    (usual invalid sheet title characters)
     // Single quote is represented as a pair ''
-    const REGEX_SHEET_TITLE_QUOTED = '(([^\*\:\/\\\\\?\[\]\\\'])+|(\\\'\\\')+)+';
+    // Former value for this constant led to "catastrophic backtracking",
+    //     unable to handle double apostrophes.
+    //     (*COMMIT) should prevent this.
+    const REGEX_SHEET_TITLE_QUOTED = "([^*:/\\\\?\[\]']|'')+";
+
+    const REGEX_CELL_TITLE_QUOTED = "~^'"
+        . self::REGEX_SHEET_TITLE_QUOTED
+        . '(:' . self::REGEX_SHEET_TITLE_QUOTED . ')?'
+        . "'!(*COMMIT)"
+        . '[$]?[A-Ia-i]?[A-Za-z][$]?(\\d+)'
+        . '$~u';
+
+    const REGEX_RANGE_TITLE_QUOTED = "~^'"
+        . self::REGEX_SHEET_TITLE_QUOTED
+        . '(:' . self::REGEX_SHEET_TITLE_QUOTED . ')?'
+        . "'!(*COMMIT)"
+        . '[$]?[A-Ia-i]?[A-Za-z][$]?(\\d+)'
+        . ':'
+        . '[$]?[A-Ia-i]?[A-Za-z][$]?(\\d+)'
+        . '$~u';
 
     /**
      * The index of the character we are currently looking at.
@@ -478,34 +498,34 @@ public function __construct(Spreadsheet $spreadsheet)
      */
     private function convert(string $token): string
     {
-        if (preg_match('/"([^"]|""){0,255}"/', $token)) {
+        if (Preg::isMatch('/"([^"]|""){0,255}"/', $token)) {
             return $this->convertString($token);
         }
         if (is_numeric($token)) {
             return $this->convertNumber($token);
         }
         // match references like A1 or $A$1
-        if (preg_match('/^\$?([A-Ia-i]?[A-Za-z])\$?(\d+)$/', $token)) {
+        if (Preg::isMatch('/^\$?([A-Ia-i]?[A-Za-z])\$?(\d+)$/', $token)) {
             return $this->convertRef2d($token);
         }
         // match external references like Sheet1!A1 or Sheet1:Sheet2!A1 or Sheet1!$A$1 or Sheet1:Sheet2!$A$1
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?(\\d+)$/u', $token)) {
+        if (Preg::isMatch('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?(\\d+)$/u', $token)) {
             return $this->convertRef3d($token);
         }
         // match external references like 'Sheet1'!A1 or 'Sheet1:Sheet2'!A1 or 'Sheet1'!$A$1 or 'Sheet1:Sheet2'!$A$1
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?[A-Ia-i]?[A-Za-z]\\$?(\\d+)$/u", $token)) {
+        if (self::matchCellSheetnameQuoted($token)) {
             return $this->convertRef3d($token);
         }
         // match ranges like A1:B2 or $A$1:$B$2
-        if (preg_match('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?(\d+)\:(\$)?[A-Ia-i]?[A-Za-z](\$)?(\d+)$/', $token)) {
+        if (Preg::isMatch('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?(\d+)\:(\$)?[A-Ia-i]?[A-Za-z](\$)?(\d+)$/', $token)) {
             return $this->convertRange2d($token);
         }
         // match external ranges like Sheet1!A1:B2 or Sheet1:Sheet2!A1:B2 or Sheet1!$A$1:$B$2 or Sheet1:Sheet2!$A$1:$B$2
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?(\\d+)\\:\$?([A-Ia-i]?[A-Za-z])?\$?(\\d+)$/u', $token)) {
+        if (Preg::isMatch('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?(\\d+)\\:\$?([A-Ia-i]?[A-Za-z])?\$?(\\d+)$/u', $token)) {
             return $this->convertRange3d($token);
         }
         // match external ranges like 'Sheet1'!A1:B2 or 'Sheet1:Sheet2'!A1:B2 or 'Sheet1'!$A$1:$B$2 or 'Sheet1:Sheet2'!$A$1:$B$2
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?([A-Ia-i]?[A-Za-z])?\\$?(\\d+)\\:\\$?([A-Ia-i]?[A-Za-z])?\\$?(\\d+)$/u", $token)) {
+        if (self::matchRangeSheetnameQuoted($token)) {
             return $this->convertRange3d($token);
         }
         // operators (including parentheses)
@@ -513,14 +533,14 @@ private function convert(string $token): string
             return pack('C', $this->ptg[$token]);
         }
         // match error codes
-        if (preg_match('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $token) || $token == '#N/A') {
+        if (Preg::isMatch('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $token) || $token == '#N/A') {
             return $this->convertError($token);
         }
-        if (preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/mui', $token) && $this->spreadsheet->getDefinedName($token) !== null) {
+        if (Preg::isMatch('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/mui', $token) && $this->spreadsheet->getDefinedName($token) !== null) {
             return $this->convertDefinedName($token);
         }
         // commented so argument number can be processed correctly. See toReversePolish().
-        /*if (preg_match("/[A-Z0-9\xc0-\xdc\.]+/", $token))
+        /*if (Preg::isMatch("/[A-Z0-9\xc0-\xdc\.]+/", $token))
         {
             return($this->convertFunction($token, $this->_func_args));
         }*/
@@ -528,10 +548,10 @@ private function convert(string $token): string
         if ($token == 'arg') {
             return '';
         }
-        if (preg_match('/^true$/i', $token)) {
+        if (Preg::isMatch('/^true$/i', $token)) {
             return $this->convertBool(1);
         }
-        if (preg_match('/^false$/i', $token)) {
+        if (Preg::isMatch('/^false$/i', $token)) {
             return $this->convertBool(0);
         }
 
@@ -547,7 +567,7 @@ private function convert(string $token): string
     private function convertNumber(mixed $num): string
     {
         // Integer in the range 0..2**16-1
-        if ((preg_match('/^\\d+$/', (string) $num)) && ($num <= 65535)) {
+        if ((Preg::isMatch('/^\\d+$/', (string) $num)) && ($num <= 65535)) {
             return pack('Cv', $this->ptg['ptgInt'], $num);
         }
 
@@ -613,7 +633,7 @@ private function convertRange2d(string $range, int $class = 0): string
     {
         // TODO: possible class value 0,1,2 check Formula.pm
         // Split the range into 2 cell refs
-        if (preg_match('/^(\$)?([A-Ia-i]?[A-Za-z])(\$)?(\d+)\:(\$)?([A-Ia-i]?[A-Za-z])(\$)?(\d+)$/', $range)) {
+        if (Preg::isMatch('/^(\$)?([A-Ia-i]?[A-Za-z])(\$)?(\d+)\:(\$)?([A-Ia-i]?[A-Za-z])(\$)?(\d+)$/', $range)) {
             [$cell1, $cell2] = explode(':', $range);
         } else {
             // TODO: use real error codes
@@ -658,7 +678,7 @@ private function convertRange3d(string $token): string
         [$cell1, $cell2] = explode(':', $range ?? '');
 
         // Convert the cell references
-        if (preg_match('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?(\\d+)$/', $cell1)) {
+        if (Preg::isMatch('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?(\\d+)$/', $cell1)) {
             [$row1, $col1] = $this->cellToPackedRowcol($cell1);
             [$row2, $col2] = $this->cellToPackedRowcol($cell2);
         } else { // It's a rows range (like 26:27)
@@ -774,11 +794,11 @@ private function convertDefinedName(string $name): string
      */
     private function getRefIndex(string $ext_ref): string
     {
-        $ext_ref = (string) preg_replace(["/^'/", "/'$/"], ['', ''], $ext_ref); // Remove leading and trailing ' if any.
+        $ext_ref = Preg::replace(["/^'/", "/'$/"], ['', ''], $ext_ref); // Remove leading and trailing ' if any.
         $ext_ref = str_replace('\'\'', '\'', $ext_ref); // Replace escaped '' with '
 
         // Check if there is a sheet range eg., Sheet1:Sheet2.
-        if (preg_match('/:/', $ext_ref)) {
+        if (Preg::isMatch('/:/', $ext_ref)) {
             [$sheet_name1, $sheet_name2] = explode(':', $ext_ref);
 
             $sheet1 = $this->getSheetIndex($sheet_name1);
@@ -894,7 +914,7 @@ private function cellToPackedRowcol(string $cell): array
      */
     private function rangeToPackedRange(string $range): array
     {
-        if (preg_match('/(\$)?(\d+)\:(\$)?(\d+)/', $range, $match) !== 1) {
+        if (!Preg::isMatch('/(\$)?(\d+)\:(\$)?(\d+)/', $range, $match)) {
             // @codeCoverageIgnoreStart
             throw new WriterException('Regexp failure in rangeToPackedRange');
             // @codeCoverageIgnoreEnd
@@ -937,7 +957,7 @@ private function rangeToPackedRange(string $range): array
      */
     private function cellToRowcol(string $cell): array
     {
-        if (preg_match('/(\$)?([A-I]?[A-Z])(\$)?(\d+)/', $cell, $match) !== 1) {
+        if (!Preg::isMatch('/(\$)?([A-I]?[A-Z])(\$)?(\d+)/', $cell, $match)) {
             // @codeCoverageIgnoreStart
             throw new WriterException('Regexp failure in cellToRowcol');
             // @codeCoverageIgnoreEnd
@@ -1053,52 +1073,109 @@ private function match(string $token): string
         }
 
         // if it's a reference A1 or $A$1 or $A1 or A$1
-        if (preg_match('/^\$?[A-Ia-i]?[A-Za-z]\$?\d+$/', $token) && !preg_match('/\d/', $this->lookAhead) && ($this->lookAhead !== ':') && ($this->lookAhead !== '.') && ($this->lookAhead !== '!')) {
+        if (
+            Preg::isMatch('/^\$?[A-Ia-i]?[A-Za-z]\$?\d+$/', $token)
+            && !Preg::isMatch('/\d/', $this->lookAhead)
+            && ($this->lookAhead !== ':')
+            && ($this->lookAhead !== '.')
+            && ($this->lookAhead !== '!')
+        ) {
             return $token;
         }
         // If it's an external reference (Sheet1!A1 or Sheet1:Sheet2!A1 or Sheet1!$A$1 or Sheet1:Sheet2!$A$1)
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?\\d+$/u', $token) && !preg_match('/\d/', $this->lookAhead) && ($this->lookAhead !== ':') && ($this->lookAhead !== '.')) {
+        if (
+            Preg::isMatch('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?\\d+$/u', $token)
+            && !Preg::isMatch('/\d/', $this->lookAhead)
+            && ($this->lookAhead !== ':')
+            && ($this->lookAhead !== '.')
+        ) {
             return $token;
         }
         // If it's an external reference ('Sheet1'!A1 or 'Sheet1:Sheet2'!A1 or 'Sheet1'!$A$1 or 'Sheet1:Sheet2'!$A$1)
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?[A-Ia-i]?[A-Za-z]\\$?\\d+$/u", $token) && !preg_match('/\d/', $this->lookAhead) && ($this->lookAhead !== ':') && ($this->lookAhead !== '.')) {
+        if (
+            self::matchCellSheetnameQuoted($token)
+            && !Preg::isMatch('/\\d/', $this->lookAhead)
+            && ($this->lookAhead !== ':') && ($this->lookAhead !== '.')
+        ) {
             return $token;
         }
         // if it's a range A1:A2 or $A$1:$A$2
-        if (preg_match('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+:(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/', $token) && !preg_match('/\d/', $this->lookAhead)) {
+        if (
+            Preg::isMatch(
+                '/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+:(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/',
+                $token
+            )
+            && !Preg::isMatch('/\d/', $this->lookAhead)
+        ) {
             return $token;
         }
         // If it's an external range like Sheet1!A1:B2 or Sheet1:Sheet2!A1:B2 or Sheet1!$A$1:$B$2 or Sheet1:Sheet2!$A$1:$B$2
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?\\d+:\$?([A-Ia-i]?[A-Za-z])?\$?\\d+$/u', $token) && !preg_match('/\d/', $this->lookAhead)) {
+        if (
+            Preg::isMatch(
+                '/^'
+                . self::REGEX_SHEET_TITLE_UNQUOTED
+                . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED
+                . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?\\d+:\$?([A-Ia-i]?[A-Za-z])?\$?\\d+$/u',
+                $token
+            )
+            && !Preg::isMatch('/\d/', $this->lookAhead)
+        ) {
             return $token;
         }
         // If it's an external range like 'Sheet1'!A1:B2 or 'Sheet1:Sheet2'!A1:B2 or 'Sheet1'!$A$1:$B$2 or 'Sheet1:Sheet2'!$A$1:$B$2
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?([A-Ia-i]?[A-Za-z])?\\$?\\d+:\\$?([A-Ia-i]?[A-Za-z])?\\$?\\d+$/u", $token) && !preg_match('/\d/', $this->lookAhead)) {
+        if (
+            self::matchRangeSheetnameQuoted($token)
+            && !Preg::isMatch('/\\d/', $this->lookAhead)
+        ) {
             return $token;
         }
         // If it's a number (check that it's not a sheet name or range)
         if (is_numeric($token) && (!is_numeric($token . $this->lookAhead) || ($this->lookAhead == '')) && ($this->lookAhead !== '!') && ($this->lookAhead !== ':')) {
             return $token;
         }
-        if (preg_match('/"([^"]|""){0,255}"/', $token) && $this->lookAhead !== '"' && (substr_count($token, '"') % 2 == 0)) {
+        if (
+            Preg::isMatch('/"([^"]|""){0,255}"/', $token)
+            && $this->lookAhead !== '"'
+            && (substr_count($token, '"') % 2 == 0)
+        ) {
             // If it's a string (of maximum 255 characters)
             return $token;
         }
         // If it's an error code
-        if (preg_match('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $token) || $token === '#N/A') {
+        if (
+            Preg::isMatch('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $token)
+            || $token === '#N/A'
+        ) {
             return $token;
         }
         // if it's a function call
-        if (preg_match("/^[A-Z0-9\xc0-\xdc\\.]+$/i", $token) && ($this->lookAhead === '(')) {
+        if (
+            Preg::isMatch("/^[A-Z0-9\xc0-\xdc\\.]+$/i", $token)
+            && ($this->lookAhead === '(')
+        ) {
             return $token;
         }
-        if (preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/miu', $token) && $this->spreadsheet->getDefinedName($token) !== null) {
+        if (
+            Preg::isMatch(
+                '/^'
+                . Calculation::CALCULATION_REGEXP_DEFINEDNAME
+                . '$/miu',
+                $token
+            )
+            && $this->spreadsheet->getDefinedName($token) !== null
+        ) {
             return $token;
         }
-        if (preg_match('/^true$/i', $token) && ($this->lookAhead === ')' || $this->lookAhead === ',')) {
+        if (
+            Preg::isMatch('/^true$/i', $token)
+            && ($this->lookAhead === ')' || $this->lookAhead === ',')
+        ) {
             return $token;
         }
-        if (preg_match('/^false$/i', $token) && ($this->lookAhead === ')' || $this->lookAhead === ',')) {
+        if (
+            Preg::isMatch('/^false$/i', $token)
+            && ($this->lookAhead === ')' || $this->lookAhead === ',')
+        ) {
             return $token;
         }
         if (str_ends_with($token, ')')) {
@@ -1180,7 +1257,7 @@ private function condition(): array
     private function expression(): array
     {
         // If it's a string return a string node
-        if (preg_match('/"([^"]|""){0,255}"/', $this->currentToken)) {
+        if (Preg::isMatch('/"([^"]|""){0,255}"/', $this->currentToken)) {
             $tmp = str_replace('""', '"', $this->currentToken);
             if (($tmp == '"') || ($tmp == '')) {
                 //    Trap for "" that has been used for an empty string
@@ -1190,12 +1267,17 @@ private function expression(): array
             $this->advance();
 
             return $result;
-        } elseif (preg_match('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $this->currentToken) || $this->currentToken == '#N/A') { // error code
+        }
+        if (
+            Preg::isMatch('/^#[A-Z0\\/]{3,5}[!?]{1}$/', $this->currentToken)
+            || $this->currentToken == '#N/A'
+        ) { // error code
             $result = $this->createTree($this->currentToken, 'ptgErr', '');
             $this->advance();
 
             return $result;
-        } elseif ($this->currentToken == '-') { // negative value
+        }
+        if ($this->currentToken == '-') { // negative value
             // catch "-" Term
             $this->advance();
             $result2 = $this->expression();
@@ -1301,20 +1383,28 @@ private function fact(): array
             return $result;
         }
         // if it's a reference
-        if (preg_match('/^\$?[A-Ia-i]?[A-Za-z]\$?\d+$/', $this->currentToken)) {
+        if (Preg::isMatch('/^\$?[A-Ia-i]?[A-Za-z]\$?\d+$/', $this->currentToken)) {
             $result = $this->createTree($this->currentToken, '', '');
             $this->advance();
 
             return $result;
         }
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?\\d+$/u', $this->currentToken)) {
+        if (
+            Preg::isMatch(
+                '/^'
+                . self::REGEX_SHEET_TITLE_UNQUOTED
+                . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED
+                . ')?\\!\$?[A-Ia-i]?[A-Za-z]\$?\\d+$/u',
+                $this->currentToken
+            )
+        ) {
             // If it's an external reference (Sheet1!A1 or Sheet1:Sheet2!A1 or Sheet1!$A$1 or Sheet1:Sheet2!$A$1)
             $result = $this->createTree($this->currentToken, '', '');
             $this->advance();
 
             return $result;
         }
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?[A-Ia-i]?[A-Za-z]\\$?\\d+$/u", $this->currentToken)) {
+        if (self::matchCellSheetnameQuoted($this->currentToken)) {
             // If it's an external reference ('Sheet1'!A1 or 'Sheet1:Sheet2'!A1 or 'Sheet1'!$A$1 or 'Sheet1:Sheet2'!$A$1)
             $result = $this->createTree($this->currentToken, '', '');
             $this->advance();
@@ -1322,8 +1412,14 @@ private function fact(): array
             return $result;
         }
         if (
-            preg_match('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+:(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/', $this->currentToken)
-            || preg_match('/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+\.\.(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/', $this->currentToken)
+            Preg::isMatch(
+                '/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+:(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/',
+                $this->currentToken
+            )
+            || Preg::isMatch(
+                '/^(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+\.\.(\$)?[A-Ia-i]?[A-Za-z](\$)?\d+$/',
+                $this->currentToken
+            )
         ) {
             // if it's a range A1:B2 or $A$1:$B$2
             // must be an error?
@@ -1332,7 +1428,16 @@ private function fact(): array
 
             return $result;
         }
-        if (preg_match('/^' . self::REGEX_SHEET_TITLE_UNQUOTED . '(\\:' . self::REGEX_SHEET_TITLE_UNQUOTED . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?\\d+:\$?([A-Ia-i]?[A-Za-z])?\$?\\d+$/u', $this->currentToken)) {
+        if (
+            Preg::isMatch(
+                '/^'
+                . self::REGEX_SHEET_TITLE_UNQUOTED
+                . '(\\:'
+                . self::REGEX_SHEET_TITLE_UNQUOTED
+                . ')?\\!\$?([A-Ia-i]?[A-Za-z])?\$?\\d+:\$?([A-Ia-i]?[A-Za-z])?\$?\\d+$/u',
+                $this->currentToken
+            )
+        ) {
             // If it's an external range (Sheet1!A1:B2 or Sheet1:Sheet2!A1:B2 or Sheet1!$A$1:$B$2 or Sheet1:Sheet2!$A$1:$B$2)
             // must be an error?
             $result = $this->createTree($this->currentToken, '', '');
@@ -1340,7 +1445,7 @@ private function fact(): array
 
             return $result;
         }
-        if (preg_match("/^'" . self::REGEX_SHEET_TITLE_QUOTED . '(\\:' . self::REGEX_SHEET_TITLE_QUOTED . ")?'\\!\\$?([A-Ia-i]?[A-Za-z])?\\$?\\d+:\\$?([A-Ia-i]?[A-Za-z])?\\$?\\d+$/u", $this->currentToken)) {
+        if (self::matchRangeSheetnameQuoted($this->currentToken)) {
             // If it's an external range ('Sheet1'!A1:B2 or 'Sheet1'!A1:B2 or 'Sheet1'!$A$1:$B$2 or 'Sheet1'!$A$1:$B$2)
             // must be an error?
             $result = $this->createTree($this->currentToken, '', '');
@@ -1360,17 +1465,28 @@ private function fact(): array
 
             return $result;
         }
-        if (preg_match("/^[A-Z0-9\xc0-\xdc\\.]+$/i", $this->currentToken) && ($this->lookAhead === '(')) {
+        if (
+            Preg::isMatch("/^[A-Z0-9\xc0-\xdc\\.]+$/i", $this->currentToken)
+            && ($this->lookAhead === '(')
+        ) {
             // if it's a function call
             return $this->func();
         }
-        if (preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/miu', $this->currentToken) && $this->spreadsheet->getDefinedName($this->currentToken) !== null) {
+        if (
+            Preg::isMatch(
+                '/^'
+                . Calculation::CALCULATION_REGEXP_DEFINEDNAME
+                . '$/miu',
+                $this->currentToken
+            )
+            && $this->spreadsheet->getDefinedName($this->currentToken) !== null
+        ) {
             $result = $this->createTree('ptgName', $this->currentToken, '');
             $this->advance();
 
             return $result;
         }
-        if (preg_match('/^true|false$/i', $this->currentToken)) {
+        if (Preg::isMatch('/^true|false$/i', $this->currentToken)) {
             $result = $this->createTree($this->currentToken, '', '');
             $this->advance();
 
@@ -1491,9 +1607,12 @@ public function toReversePolish(array $tree = []): string
         }
         // if it's a function convert it here (so we can set it's arguments)
         if (
-            preg_match("/^[A-Z0-9\xc0-\xdc\\.]+$/", $tree['value'])
-            && !preg_match('/^([A-Ia-i]?[A-Za-z])(\d+)$/', $tree['value'])
-            && !preg_match('/^[A-Ia-i]?[A-Za-z](\\d+)\\.\\.[A-Ia-i]?[A-Za-z](\\d+)$/', $tree['value'])
+            Preg::isMatch("/^[A-Z0-9\xc0-\xdc\\.]+$/", $tree['value'])
+            && !Preg::isMatch('/^([A-Ia-i]?[A-Za-z])(\d+)$/', $tree['value'])
+            && !Preg::isMatch(
+                '/^[A-Ia-i]?[A-Za-z](\\d+)\\.\\.[A-Ia-i]?[A-Za-z](\\d+)$/',
+                $tree['value']
+            )
             && !is_numeric($tree['value'])
             && !isset($this->ptg[$tree['value']])
         ) {
@@ -1511,4 +1630,20 @@ public function toReversePolish(array $tree = []): string
 
         return $polish . $converted_tree;
     }
+
+    public static function matchCellSheetnameQuoted(string $token): bool
+    {
+        return Preg::isMatch(
+            self::REGEX_CELL_TITLE_QUOTED,
+            $token
+        );
+    }
+
+    public static function matchRangeSheetnameQuoted(string $token): bool
+    {
+        return Preg::isMatch(
+            self::REGEX_RANGE_TITLE_QUOTED,
+            $token
+        );
+    }
 }
diff --git a/src/PhpSpreadsheet/Writer/Xls/Workbook.php b/src/PhpSpreadsheet/Writer/Xls/Workbook.php
index c2b4496a53..43e9f1cd77 100644
--- a/src/PhpSpreadsheet/Writer/Xls/Workbook.php
+++ b/src/PhpSpreadsheet/Writer/Xls/Workbook.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xls;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\DefinedName;
@@ -508,14 +509,13 @@ private function writeAllStyles(): void
     private function parseDefinedNameValue(DefinedName $definedName): string
     {
         $definedRange = $definedName->getValue();
-        $splitCount = preg_match_all(
+        $splitCount = Preg::matchAllWithOffsets(
             '/' . Calculation::CALCULATION_REGEXP_CELLREF . '/mui',
             $definedRange,
-            $splitRanges,
-            PREG_OFFSET_CAPTURE
+            $splitRanges
         );
 
-        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
+        $lengths = array_map([StringHelper::class, 'strlenAllowNull'], array_column($splitRanges[0], 0));
         $offsets = array_column($splitRanges[0], 1);
 
         $worksheets = $splitRanges[2];
diff --git a/src/PhpSpreadsheet/Writer/Xls/Worksheet.php b/src/PhpSpreadsheet/Writer/Xls/Worksheet.php
index 9802bfb58f..0f762f27db 100644
--- a/src/PhpSpreadsheet/Writer/Xls/Worksheet.php
+++ b/src/PhpSpreadsheet/Writer/Xls/Worksheet.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xls;
 
+use Composer\Pcre\Preg;
 use GdImage;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
@@ -461,11 +462,11 @@ public function close(): void
             if (str_contains($url, 'sheet://')) {
                 // internal to current workbook
                 $url = str_replace('sheet://', 'internal:', $url);
-            } elseif (preg_match('/^(http:|https:|ftp:|mailto:)/', $url)) {
+            } elseif (Preg::isMatch('/^(http:|https:|ftp:|mailto:)/', $url)) {
                 // URL
-            } elseif (!empty($hyperlinkbase) && preg_match('~^([A-Za-z]:)?[/\\\\]~', $url) !== 1) {
+            } elseif (!empty($hyperlinkbase) && !Preg::isMatch('~^([A-Za-z]:)?[/\\\\]~', $url)) {
                 $url = "$hyperlinkbase$url";
-                if (preg_match('/^(http:|https:|ftp:|mailto:)/', $url) !== 1) {
+                if (!Preg::isMatch('/^(http:|https:|ftp:|mailto:)/', $url)) {
                     $url = 'external:' . $url;
                 }
             } else {
@@ -943,10 +944,10 @@ private function writeUrl(int $row, int $col, string $url): void
     private function writeUrlRange(int $row1, int $col1, int $row2, int $col2, string $url): void
     {
         // Check for internal/external sheet links or default to web link
-        if (preg_match('[^internal:]', $url)) {
+        if (Preg::isMatch('[^internal:]', $url)) {
             $this->writeUrlInternal($row1, $col1, $row2, $col2, $url);
         }
-        if (preg_match('[^external:]', $url)) {
+        if (Preg::isMatch('[^external:]', $url)) {
             $this->writeUrlExternal($row1, $col1, $row2, $col2, $url);
         }
 
@@ -979,8 +980,7 @@ public function writeUrlWeb(int $row1, int $col1, int $row2, int $col2, string $
 
         // Convert URL to a null terminated wchar string
 
-        /** @phpstan-ignore-next-line */
-        $url = implode("\0", preg_split("''", $url, -1, PREG_SPLIT_NO_EMPTY));
+        $url = implode("\0", Preg::split("''", $url, -1, PREG_SPLIT_NO_EMPTY));
         $url = $url . "\0\0\0";
 
         // Pack the length of the URL
@@ -1013,7 +1013,7 @@ private function writeUrlInternal(int $row1, int $col1, int $row2, int $col2, st
         $record = 0x01B8; // Record identifier
 
         // Strip URL type
-        $url = (string) preg_replace('/^internal:/', '', $url);
+        $url = Preg::replace('/^internal:/', '', $url);
 
         // Pack the undocumented parts of the hyperlink stream
         $unknown1 = pack('H*', 'D0C9EA79F9BACE118C8200AA004BA90B02000000');
@@ -1060,7 +1060,7 @@ private function writeUrlExternal(int $row1, int $col1, int $row2, int $col2, st
     {
         // Network drives are different. We will handle them separately
         // MS/Novell network drives and shares start with \\
-        if (preg_match('[^external:\\\\]', $url)) {
+        if (Preg::isMatch('[^external:\\\\]', $url)) {
             return;
         }
 
@@ -1068,7 +1068,7 @@ private function writeUrlExternal(int $row1, int $col1, int $row2, int $col2, st
 
         // Strip URL type and change Unix dir separator to Dos style (if needed)
         //
-        $url = (string) preg_replace(['/^external:/', '/\//'], ['', '\\'], $url);
+        $url = Preg::replace(['/^external:/', '/\//'], ['', '\\'], $url);
 
         // Determine if the link is relative or absolute:
         //   relative if link contains no dir separator, "somefile.xls"
@@ -1076,7 +1076,7 @@ private function writeUrlExternal(int $row1, int $col1, int $row2, int $col2, st
         //   otherwise, absolute
 
         $absolute = 0x00; // relative path
-        if (preg_match('/^[A-Z]:/', $url)) {
+        if (Preg::isMatch('/^[A-Z]:/', $url)) {
             $absolute = 0x02; // absolute path on Windows, e.g. C:\...
         }
         $link_type = 0x01 | $absolute;
@@ -1085,7 +1085,7 @@ private function writeUrlExternal(int $row1, int $col1, int $row2, int $col2, st
         // parameters accordingly.
         // Split the dir name and sheet name (if it exists)
         $dir_long = $url;
-        if (preg_match('/\\#/', $url)) {
+        if (Preg::isMatch('/\\#/', $url)) {
             $link_type |= 0x08;
         }
 
@@ -1093,11 +1093,11 @@ private function writeUrlExternal(int $row1, int $col1, int $row2, int $col2, st
         $link_type = pack('V', $link_type);
 
         // Calculate the up-level dir count e.g.. (..\..\..\ == 3)
-        $up_count = preg_match_all('/\\.\\.\\\\/', $dir_long, $useless);
+        $up_count = Preg::isMatchAll('/\\.\\.\\\\/', $dir_long, $useless);
         $up_count = pack('v', $up_count);
 
         // Store the short dos dir name (null terminated)
-        $dir_short = (string) preg_replace('/\\.\\.\\\\/', '', $dir_long) . "\0";
+        $dir_short = Preg::replace('/\\.\\.\\\\/', '', $dir_long) . "\0";
 
         // Store the long dir name as a wchar string (non-null terminated)
         //$dir_long = $dir_long . "\0";
@@ -2657,7 +2657,7 @@ private function writeDataValidity(): void
                 $options |= $errorStyle << 4;
 
                 // explicit formula?
-                if ($type == 0x03 && preg_match('/^\".*\"$/', $dataValidation->getFormula1())) {
+                if ($type == 0x03 && Preg::isMatch('/^\".*\"$/', $dataValidation->getFormula1())) {
                     $options |= 0x01 << 7;
                 }
 
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/DefinedNames.php b/src/PhpSpreadsheet/Writer/Xlsx/DefinedNames.php
index 4dac1855e8..f8a70ea55a 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/DefinedNames.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/DefinedNames.php
@@ -2,10 +2,12 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 
+use Composer\Pcre\Preg;
 use Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\DefinedName;
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
 use PhpOffice\PhpSpreadsheet\Shared\XMLWriter;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet as ActualWorksheet;
@@ -192,14 +194,13 @@ private function writeNamedRangeForPrintArea(ActualWorksheet $worksheet, int $wo
     private function getDefinedRange(DefinedName $definedName): string
     {
         $definedRange = $definedName->getValue();
-        $splitCount = preg_match_all(
+        $splitCount = Preg::matchAllWithOffsets(
             '/' . Calculation::CALCULATION_REGEXP_CELLREF_RELATIVE . '/mui',
             $definedRange,
-            $splitRanges,
-            PREG_OFFSET_CAPTURE
+            $splitRanges
         );
 
-        $lengths = array_map('strlen', array_column($splitRanges[0], 0));
+        $lengths = array_map([StringHelper::class, 'strlenAllowNull'], array_column($splitRanges[0], 0));
         $offsets = array_column($splitRanges[0], 1);
 
         $worksheets = $splitRanges[2];
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Drawing.php b/src/PhpSpreadsheet/Writer/Xlsx/Drawing.php
index 8a17eb9f16..ed441b1686 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Drawing.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Drawing.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Reader\Xlsx\Namespaces;
 use PhpOffice\PhpSpreadsheet\Shared\Drawing as SharedDrawing;
@@ -507,7 +508,7 @@ public function writeVMLHeaderFooterImages(\PhpOffice\PhpSpreadsheet\Worksheet\W
     private function writeVMLHeaderFooterImage(XMLWriter $objWriter, string $reference, HeaderFooterDrawing $image): void
     {
         // Calculate object id
-        if (preg_match('{(\d+)}', md5($reference), $m) !== 1) {
+        if (!Preg::isMatch('{(\d+)}', md5($reference), $m)) {
             // @codeCoverageIgnoreStart
             throw new WriterException('Regexp failure in writeVMLHeaderFooterImage');
             // @codeCoverageIgnoreEnd
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/FunctionPrefix.php b/src/PhpSpreadsheet/Writer/Xlsx/FunctionPrefix.php
index 16834dc04d..31e1e3e0b2 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/FunctionPrefix.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/FunctionPrefix.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 
 class FunctionPrefix
@@ -184,7 +185,7 @@ class FunctionPrefix
      */
     protected static function addXlfnPrefix(string $functionString): string
     {
-        return (string) preg_replace(self::XLFNREGEXP, '_xlfn.$1(', $functionString);
+        return Preg::replace(self::XLFNREGEXP, '_xlfn.$1(', $functionString);
     }
 
     /**
@@ -192,7 +193,7 @@ protected static function addXlfnPrefix(string $functionString): string
      */
     protected static function addXlwsPrefix(string $functionString): string
     {
-        return (string) preg_replace(self::XLWSREGEXP, '_xlws.$1(', $functionString);
+        return Preg::replace(self::XLWSREGEXP, '_xlws.$1(', $functionString);
     }
 
     /**
@@ -200,9 +201,9 @@ protected static function addXlwsPrefix(string $functionString): string
      */
     public static function addFunctionPrefix(string $functionString): string
     {
-        $functionString = (string) preg_replace_callback(
+        $functionString = Preg::replaceCallback(
             Calculation::CALCULATION_REGEXP_CELLREF_SPILL,
-            fn (array $matches) => 'ANCHORARRAY(' . substr($matches[0], 0, -1) . ')',
+            fn (array $matches) => 'ANCHORARRAY(' . substr((string) $matches[0], 0, -1) . ')',
             $functionString
         );
 
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
index d36e1bf902..f6dd83527c 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 
+use Composer\Pcre\Preg;
 use PhpOffice\PhpSpreadsheet\Calculation\Information\ErrorValue;
 use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
@@ -1543,18 +1544,17 @@ private function writeCellFormula(XMLWriter $objWriter, string $cellValue, Cell
 
     private function parseRef(string $coordinate, string $ref): string
     {
-        if (preg_match('/^([A-Z]{1,3})([0-9]{1,7})(:([A-Z]{1,3})([0-9]{1,7}))?$/', $ref, $matches) !== 1) {
+        if (!Preg::isMatch('/^([A-Z]{1,3})([0-9]{1,7})(:([A-Z]{1,3})([0-9]{1,7}))?$/', $ref, $matches)) {
             return $ref;
         }
         if (!isset($matches[3])) { // single cell, not range
             return $coordinate;
         }
         $minRow = (int) $matches[2];
-        // https://github.com/phpstan/phpstan/issues/11602
-        $maxRow = (int) $matches[5]; // @phpstan-ignore-line
+        $maxRow = (int) $matches[5];
         $rows = $maxRow - $minRow + 1;
         $minCol = Coordinate::columnIndexFromString($matches[1]);
-        $maxCol = Coordinate::columnIndexFromString($matches[4]); // @phpstan-ignore-line
+        $maxCol = Coordinate::columnIndexFromString($matches[4]);
         $cols = $maxCol - $minCol + 1;
         $firstCellArray = Coordinate::indexesFromString($coordinate);
         $lastRow = $firstCellArray[1] + $rows - 1;
diff --git a/tests/PhpSpreadsheetTests/Document/PropertiesTest.php b/tests/PhpSpreadsheetTests/Document/PropertiesTest.php
index 1b32aeaec9..dd8dabb21f 100644
--- a/tests/PhpSpreadsheetTests/Document/PropertiesTest.php
+++ b/tests/PhpSpreadsheetTests/Document/PropertiesTest.php
@@ -8,6 +8,7 @@
 use DateTimeZone;
 use PhpOffice\PhpSpreadsheet\Document\Properties;
 use PhpOffice\PhpSpreadsheet\Shared\Date;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class PropertiesTest extends TestCase
@@ -16,7 +17,7 @@ class PropertiesTest extends TestCase
 
     private float $startTime;
 
-    protected function setup(): void
+    protected function setUp(): void
     {
         do {
             // loop to avoid rare situation where timestamp changes
@@ -44,12 +45,19 @@ public function testSetCreator(): void
         self::assertSame($creator, $this->properties->getCreator());
     }
 
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerCreationTime')]
+    #[DataProvider('providerCreationTime')]
     public function testSetCreated(null|int $expectedCreationTime, null|int|string $created): void
     {
-        $expectedCreationTime = $expectedCreationTime ?? $this->startTime;
-
-        $this->properties->setCreated($created);
+        if ($expectedCreationTime === null) {
+            do {
+                // loop to avoid rare situation where timestamp changes
+                $expectedCreationTime = (float) (new DateTime())->format('U');
+                $this->properties->setCreated($created);
+                $endTime = (float) (new DateTime())->format('U');
+            } while ($expectedCreationTime !== $endTime);
+        } else {
+            $this->properties->setCreated($created);
+        }
         self::assertEquals($expectedCreationTime, $this->properties->getCreated());
     }
 
@@ -71,12 +79,19 @@ public function testSetModifier(): void
         self::assertSame($creator, $this->properties->getLastModifiedBy());
     }
 
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerModifiedTime')]
+    #[DataProvider('providerModifiedTime')]
     public function testSetModified(mixed $expectedModifiedTime, null|int|string $modified): void
     {
-        $expectedModifiedTime = $expectedModifiedTime ?? $this->startTime;
-
-        $this->properties->setModified($modified);
+        if ($expectedModifiedTime === null) {
+            do {
+                // loop to avoid rare situation where timestamp changes
+                $expectedModifiedTime = (float) (new DateTime())->format('U');
+                $this->properties->setModified($modified);
+                $endTime = (float) (new DateTime())->format('U');
+            } while ($expectedModifiedTime !== $endTime);
+        } else {
+            $this->properties->setModified($modified);
+        }
         self::assertEquals($expectedModifiedTime, $this->properties->getModified());
     }
 
@@ -146,7 +161,7 @@ public function testSetManager(): void
         self::assertSame($manager, $this->properties->getManager());
     }
 
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerCustomProperties')]
+    #[DataProvider('providerCustomProperties')]
     public function testSetCustomProperties(mixed $expectedType, mixed $expectedValue, string $propertyName, null|bool|float|int|string $propertyValue, ?string $propertyType = null): void
     {
         if ($propertyType === null) {
diff --git a/tests/PhpSpreadsheetTests/Reader/Ods/FormulaTranslatorTest.php b/tests/PhpSpreadsheetTests/Reader/Ods/FormulaTranslatorTest.php
new file mode 100644
index 0000000000..8246784bf3
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Ods/FormulaTranslatorTest.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
+
+use PhpOffice\PhpSpreadsheet\Reader\Ods\FormulaTranslator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class FormulaTranslatorTest extends TestCase
+{
+    #[DataProvider('addressesProvider')]
+    public function testAddresses(string $result, string $address): void
+    {
+        self::assertSame($result, FormulaTranslator::convertToExcelAddressValue($address));
+    }
+
+    public static function addressesProvider(): array
+    {
+        return [
+            'range period in sheet name' => ["'sheet1.bug'!a1:a5", "'sheet1.bug'.a1:'sheet1.bug'.a5"],
+            'range special chars and period in sheet name' => ["'#sheet1.x'!a1:a5", "'#sheet1.x'.a1:'#sheet1.x'.a5"],
+            'cell period in sheet name' => ["'sheet1.bug'!b9", "'sheet1.bug'.b9"],
+            'range unquoted sheet name' => ['sheet1!b9:c12', 'sheet1.b9:sheet1.c12'],
+            'range unquoted sheet name with $' => ['sheet1!$b9:c$12', 'sheet1.$b9:sheet1.c$12'],
+            'range quoted sheet name with $' => ["'sheet1'!\$b9:c\$12", '\'sheet1\'.$b9:\'sheet1\'.c$12'],
+            'cell unquoted sheet name' => ['sheet1!B$9', 'sheet1.B$9'],
+            'range no sheet name all dollars' => ['$B$9:$C$12', '$B$9:$C$12'],
+            'range no sheet name some dollars' => ['B$9:$C12', 'B$9:$C12'],
+            'range no sheet name no dollars' => ['B9:C12', 'B9:C12'],
+        ];
+    }
+
+    #[DataProvider('formulaProvider')]
+    public function testFormulas(string $result, string $formula): void
+    {
+        self::assertSame($result, FormulaTranslator::convertToExcelFormulaValue($formula));
+    }
+
+    public static function formulaProvider(): array
+    {
+        return [
+            'ranges no sheet name' => [
+                'SUM(A5:A7,B$5:$B7)',
+                'SUM([.A5:.A7];[.B$5:.$B7])',
+            ],
+            'ranges sheet name with period' => [
+                'SUM(\'test.bug\'!A5:A7,\'test.bug\'!B5:B7)',
+                'SUM([\'test.bug\'.A5:.A7];[\'test.bug\'.B5:.B7])',
+            ],
+            'ranges unquoted sheet name' => [
+                'SUM(testbug!A5:A7,testbug!B5:B7)',
+                'SUM([testbug.A5:.A7];[testbug.B5:.B7])',
+            ],
+            'ranges quoted sheet name without period' => [
+                'SUM(\'testbug\'!A5:A7,\'testbug\'!B5:B7)',
+                'SUM([\'testbug\'.A5:.A7];[\'testbug\'.B5:.B7])',
+            ],
+        ];
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/SpreadsheetDuplicateSheetTest.php b/tests/PhpSpreadsheetTests/SpreadsheetDuplicateSheetTest.php
new file mode 100644
index 0000000000..b84026700e
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/SpreadsheetDuplicateSheetTest.php
@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class SpreadsheetDuplicateSheetTest extends TestCase
+{
+    private ?Spreadsheet $spreadsheet = null;
+
+    protected function tearDown(): void
+    {
+        if ($this->spreadsheet !== null) {
+            $this->spreadsheet->disconnectWorksheets();
+            $this->spreadsheet = null;
+        }
+    }
+
+    public function testDuplicate(): void
+    {
+        $this->spreadsheet = new Spreadsheet();
+        $sheet = $this->spreadsheet->getActiveSheet();
+        $sheet->setTitle('original');
+        $sheet->getCell('A1')->setValue('text1');
+        $sheet->getCell('A2')->setValue('text2');
+        $sheet->getStyle('A1')
+            ->getFont()
+            ->setBold(true);
+        $sheet3 = $this->spreadsheet->createSheet();
+        $sheet3->setTitle('added');
+        $newSheet = $this->spreadsheet
+            ->duplicateWorksheetByTitle('original');
+        $this->spreadsheet->duplicateWorksheetByTitle('added');
+        self::assertSame('original 1', $newSheet->getTitle());
+        self::assertSame(
+            'text1',
+            $newSheet->getCell('A1')->getValue()
+        );
+        self::assertSame(
+            'text2',
+            $newSheet->getCell('A2')->getValue()
+        );
+        self::assertTrue(
+            $newSheet->getStyle('A1')->getFont()->getBold()
+        );
+        self::assertFalse(
+            $newSheet->getStyle('A2')->getFont()->getBold()
+        );
+        $sheetNames = [];
+        foreach ($this->spreadsheet->getWorksheetIterator() as $worksheet) {
+            $sheetNames[] = $worksheet->getTitle();
+        }
+        $expected = ['original', 'original 1', 'added', 'added 1'];
+        self::assertSame($expected, $sheetNames);
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Worksheet/ColumnRowStyleTest.php b/tests/PhpSpreadsheetTests/Worksheet/ColumnRowStyleTest.php
new file mode 100644
index 0000000000..d5197fb9c7
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Worksheet/ColumnRowStyleTest.php
@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Worksheet;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class ColumnRowStyleTest extends TestCase
+{
+    public function testColumnStyle(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $columnStyle = $sheet->getStyle('B:C');
+        $columnStyle->applyFromArray([
+            'font' => ['name' => 'Who knows'],
+        ]);
+        self::assertSame(
+            'Who knows',
+            $sheet->getColumnStyle('B')?->getFont()->getName()
+        );
+        self::assertSame(
+            'Who knows',
+            $sheet->getColumnStyle('C')?->getFont()->getName()
+        );
+        self::assertNull(
+            $sheet->getColumnStyle('A')?->getFont()->getName()
+        );
+        self::assertNull(
+            $sheet->getColumnStyle('D')?->getFont()->getName()
+        );
+
+        $spreadsheet->disconnectWorksheets();
+    }
+
+    public function testRowStyle(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $rowStyle = $sheet->getStyle('2:3');
+        $rowStyle->applyFromArray([
+            'font' => ['name' => 'Who knows'],
+        ]);
+        self::assertSame(
+            'Who knows',
+            $sheet->getRowStyle(2)?->getFont()->getName()
+        );
+        self::assertSame(
+            'Who knows',
+            $sheet->getRowStyle(3)?->getFont()->getName()
+        );
+        self::assertNull(
+            $sheet->getRowStyle(1)?->getFont()->getName()
+        );
+        self::assertNull(
+            $sheet->getRowStyle(4)?->getFont()->getName()
+        );
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Dompdf/HideMergeTest.php b/tests/PhpSpreadsheetTests/Writer/Dompdf/HideMergeTest.php
new file mode 100644
index 0000000000..c27545ea57
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Dompdf/HideMergeTest.php
@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Dompdf;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Color;
+use PhpOffice\PhpSpreadsheet\Writer\Pdf\Dompdf;
+use PHPUnit\Framework\TestCase;
+
+class HideMergeTest extends TestCase
+{
+    public function testHideWithMerge(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        // just some labels for better visualisation of the problem
+        $worksheet->setCellValue('A1', 'A');
+        $worksheet->setCellValue('B1', 'B');
+        $worksheet->setCellValue('C1', 'C');
+        // setting the row height to better visualize the problem
+        for ($i = 1; $i <= 10; ++$i) {
+            $worksheet->getRowDimension($i)->setRowHeight(17);
+        }
+        // Headline - merged over two cells AND two rows
+        $worksheet->mergeCells('B2:C3');
+        $worksheet->setCellValue('B2', 'Hello World Headline');
+        $worksheet->getStyle('B2:C3')->getFont()->setBold(true);
+        $worksheet->getStyle('B2:C3')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_CENTER);
+        $worksheet->getStyle('B2:C3')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 1 - merge over two rows
+        $worksheet->mergeCells('B4:B5');
+        $worksheet->mergeCells('C4:C5');
+        $worksheet->setCellValue('B4', 'Label 1');
+        $worksheet->setCellValue('C4', 'Text 1');
+        $worksheet->getStyle('B4:B5')->getFont()->setBold(true);
+        $worksheet->getStyle('B4:C5')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B4:B5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C4:C5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 2 - merge over two rows
+        $worksheet->mergeCells('B6:B7');
+        $worksheet->mergeCells('C6:C7');
+        $worksheet->setCellValue('B6', 'Label 2');
+        $worksheet->setCellValue('C6', 'Text 2');
+        $worksheet->getStyle('B6:B7')->getFont()->setBold(true);
+        $worksheet->getStyle('B6:C7')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B6:B7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C6:C7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // This is where the error was introduced (!!!)
+        $worksheet->getColumnDimension('A')->setVisible(false);
+        $Dompdf = new Dompdf($spreadsheet);
+        $html = $Dompdf->generateHtmlAll();
+        $html = preg_replace('/^\\s+/m', '', $html) ?? $html;
+        $html = preg_replace('/[\\n\\r]/', '', $html) ?? $html;
+        self::assertStringContainsString(
+            'table.sheet0 .column0 { display:none }',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row0">'
+                . '<td class="column0 style0 s" style="width:42pt; height:17pt">A</td>'
+                . '<td class="column1 style0 s" style="width:42pt; height:17pt">B</td>'
+                . '<td class="column2 style0 s" style="width:42pt; height:17pt">C</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row1">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '<td class="column1 style1 s style1" style="width:84pt; height:17pt" colspan="2" rowspan="2">Hello World Headline</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row2">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row3">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '<td class="column1 style2 s style2" style="width:42pt; height:17pt" rowspan="2">Label 1</td>'
+                . '<td class="column2 style3 s style3" style="width:42pt; height:17pt" rowspan="2">Text 1</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row4">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row5">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '<td class="column1 style2 s style2" style="width:42pt; height:17pt" rowspan="2">Label 2</td>'
+                . '<td class="column2 style3 s style3" style="width:42pt; height:17pt" rowspan="2">Text 2</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row6">'
+                . '<td class="column0 style0" style="width:42pt; height:17pt">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Html/HideMergeTest.php b/tests/PhpSpreadsheetTests/Writer/Html/HideMergeTest.php
new file mode 100644
index 0000000000..1075bcca2b
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Html/HideMergeTest.php
@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Html;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Color;
+use PhpOffice\PhpSpreadsheet\Writer\Html;
+use PHPUnit\Framework\TestCase;
+
+class HideMergeTest extends TestCase
+{
+    public function testHideWithMerge(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        // just some labels for better visualisation of the problem
+        $worksheet->setCellValue('A1', 'A');
+        $worksheet->setCellValue('B1', 'B');
+        $worksheet->setCellValue('C1', 'C');
+        // setting the row height to better visualize the problem
+        for ($i = 1; $i <= 10; ++$i) {
+            $worksheet->getRowDimension($i)->setRowHeight(17);
+        }
+        // Headline - merged over two cells AND two rows
+        $worksheet->mergeCells('B2:C3');
+        $worksheet->setCellValue('B2', 'Hello World Headline');
+        $worksheet->getStyle('B2:C3')->getFont()->setBold(true);
+        $worksheet->getStyle('B2:C3')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_CENTER);
+        $worksheet->getStyle('B2:C3')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 1 - merge over two rows
+        $worksheet->mergeCells('B4:B5');
+        $worksheet->mergeCells('C4:C5');
+        $worksheet->setCellValue('B4', 'Label 1');
+        $worksheet->setCellValue('C4', 'Text 1');
+        $worksheet->getStyle('B4:B5')->getFont()->setBold(true);
+        $worksheet->getStyle('B4:C5')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B4:B5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C4:C5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 2 - merge over two rows
+        $worksheet->mergeCells('B6:B7');
+        $worksheet->mergeCells('C6:C7');
+        $worksheet->setCellValue('B6', 'Label 2');
+        $worksheet->setCellValue('C6', 'Text 2');
+        $worksheet->getStyle('B6:B7')->getFont()->setBold(true);
+        $worksheet->getStyle('B6:C7')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B6:B7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C6:C7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // This is where the error was introduced (!!!)
+        $worksheet->getColumnDimension('A')->setVisible(false);
+        $Dompdf = new Html($spreadsheet);
+        $html = $Dompdf->generateHtmlAll();
+        $html = preg_replace('/^\\s+/m', '', $html) ?? $html;
+        $html = preg_replace('/[\\n\\r]/', '', $html) ?? $html;
+        self::assertStringContainsString(
+            'table.sheet0 .column0 { display:none }',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row0">'
+                . '<td class="column0 style0 s">A</td>'
+                . '<td class="column1 style0 s">B</td>'
+                . '<td class="column2 style0 s">C</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row1">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '<td class="column1 style1 s style1" colspan="2" rowspan="2">Hello World Headline</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row2">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row3">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '<td class="column1 style2 s style2" rowspan="2">Label 1</td>'
+                . '<td class="column2 style3 s style3" rowspan="2">Text 1</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row4">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row5">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '<td class="column1 style2 s style2" rowspan="2">Label 2</td>'
+                . '<td class="column2 style3 s style3" rowspan="2">Text 2</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row6">'
+                . '<td class="column0 style0">&nbsp;</td>'
+                . '</tr>',
+            $html
+        );
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Html/MailtoTest.php b/tests/PhpSpreadsheetTests/Writer/Html/MailtoTest.php
new file mode 100644
index 0000000000..e9f250d37f
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Html/MailtoTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Html;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Writer\Html as HtmlWriter;
+use PHPUnit\Framework\TestCase;
+
+class MailtoTest extends TestCase
+{
+    public function testBadHyperlink(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        $worksheet->setCellValue('A1', 'Mail Me!');
+        $worksheet->getCell('A1')
+            ->getHyperlink()
+            ->setUrl('mailto:me@example.com');
+        $worksheet->setCellValue('A2', 'Mail You!');
+        $worksheet->getCell('A2')
+            ->getHyperlink()
+            ->setTooltip('go ahead')
+            ->setUrl('mailto:you@example.com');
+        $writer = new HtmlWriter($spreadsheet);
+        $html = $writer->generateHtmlAll();
+        self::assertStringContainsString('<a href="mailto:me@example.com">Mail Me!</a>', $html);
+        self::assertStringContainsString('<a href="mailto:you@example.com" title="go ahead">Mail You!</a>', $html);
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Html/NoJavascriptLinksTest.php b/tests/PhpSpreadsheetTests/Writer/Html/NoJavascriptLinksTest.php
index 7b1a633bc1..cc0511d4fe 100644
--- a/tests/PhpSpreadsheetTests/Writer/Html/NoJavascriptLinksTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Html/NoJavascriptLinksTest.php
@@ -25,7 +25,7 @@ public function testNoJavascriptLinks(): void
 
         $writer = new Html($spreadsheet);
         $html = $writer->generateHTMLAll();
-        self::assertStringContainsString('<td class="column0 style0 s"><a href="http://www.example.com" title="">Click me</a></td>', $html, 'http hyperlink retained');
+        self::assertStringContainsString('<td class="column0 style0 s"><a href="http://www.example.com">Click me</a></td>', $html, 'http hyperlink retained');
         self::assertStringContainsString('<td class="column0 style0 s">javascript:alert(\'hello1\')</td>', $html, 'javascript hyperlink dropped');
         self::assertStringContainsString('<td class="column0 style0 f">javascript:alert(\'hello2\')</td>', $html, 'javascript hyperlink function dropped');
         $spreadsheet->disconnectWorksheets();
diff --git a/tests/PhpSpreadsheetTests/Writer/Mpdf/HideMergeTest.php b/tests/PhpSpreadsheetTests/Writer/Mpdf/HideMergeTest.php
new file mode 100644
index 0000000000..a3b789d982
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Mpdf/HideMergeTest.php
@@ -0,0 +1,131 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Mpdf;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Color;
+use PhpOffice\PhpSpreadsheet\Writer\Pdf\Mpdf;
+use PHPUnit\Framework\TestCase;
+
+class HideMergeTest extends TestCase
+{
+    public function testHideWithMerge(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        // just some labels for better visualisation of the problem
+        $worksheet->setCellValue('A1', 'A');
+        $worksheet->setCellValue('B1', 'B');
+        $worksheet->setCellValue('C1', 'C');
+        // setting the row height to better visualize the problem
+        for ($i = 1; $i <= 10; ++$i) {
+            $worksheet->getRowDimension($i)->setRowHeight(17);
+        }
+        // Headline - merged over two cells AND two rows
+        $worksheet->mergeCells('B2:C3');
+        $worksheet->setCellValue('B2', 'Hello World Headline');
+        $worksheet->getStyle('B2:C3')->getFont()->setBold(true);
+        $worksheet->getStyle('B2:C3')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_CENTER);
+        $worksheet->getStyle('B2:C3')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 1 - merge over two rows
+        $worksheet->mergeCells('B4:B5');
+        $worksheet->mergeCells('C4:C5');
+        $worksheet->setCellValue('B4', 'Label 1');
+        $worksheet->setCellValue('C4', 'Text 1');
+        $worksheet->getStyle('B4:B5')->getFont()->setBold(true);
+        $worksheet->getStyle('B4:C5')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B4:B5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C4:C5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 2 - merge over two rows
+        $worksheet->mergeCells('B6:B7');
+        $worksheet->mergeCells('C6:C7');
+        $worksheet->setCellValue('B6', 'Label 2');
+        $worksheet->setCellValue('C6', 'Text 2');
+        $worksheet->getStyle('B6:B7')->getFont()->setBold(true);
+        $worksheet->getStyle('B6:C7')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B6:B7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C6:C7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // This is where the error was introduced (!!!)
+        $worksheet->getColumnDimension('A')->setVisible(false);
+        $mpdf = new Mpdf($spreadsheet);
+        $html = $mpdf->generateHtmlAll();
+        $html = preg_replace('/^\\s+/m', '', $html) ?? $html;
+        $html = preg_replace('/[\\n\\r]/', '', $html) ?? $html;
+        self::assertStringContainsString(
+            '<tr class="row0">'
+                . '<td class="column1 style0 s" style="width:42pt; height:17pt">B</td>'
+                . '<td class="column2 style0 s" style="width:42pt; height:17pt">C</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row1">'
+                . '<td class="column1 style1 s style1" style="width:84pt; height:17pt" colspan="2" rowspan="2">Hello World Headline</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row2">'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row3">'
+                . '<td class="column1 style2 s style2" style="width:42pt; height:17pt" rowspan="2">Label 1</td>'
+                . '<td class="column2 style3 s style3" style="width:42pt; height:17pt" rowspan="2">Text 1</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row4">'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row5">'
+                . '<td class="column1 style2 s style2" style="width:42pt; height:17pt" rowspan="2">Label 2</td>'
+                . '<td class="column2 style3 s style3" style="width:42pt; height:17pt" rowspan="2">Text 2</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr class="row6">'
+                . '</tr>',
+            $html
+        );
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Ods/AutoFilterTest.php b/tests/PhpSpreadsheetTests/Writer/Ods/AutoFilterTest.php
index ddfe85570a..952db5cb5b 100644
--- a/tests/PhpSpreadsheetTests/Writer/Ods/AutoFilterTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Ods/AutoFilterTest.php
@@ -32,4 +32,29 @@ public function testAutoFilterWriter(): void
 
         self::assertSame('A1:C9', $reloaded->getActiveSheet()->getAutoFilter()->getRange());
     }
+
+    public function testPeriodInSheetNames(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        $worksheet->setTitle('work.sheet');
+
+        $dataSet = [
+            ['Year', 'Quarter', 'Sales'],
+            [2020, 'Q1', 100],
+            [2020, 'Q2', 120],
+            [2020, 'Q3', 140],
+            [2020, 'Q4', 160],
+            [2021, 'Q1', 180],
+            [2021, 'Q2', 75],
+            [2021, 'Q3', 0],
+            [2021, 'Q4', 0],
+        ];
+        $worksheet->fromArray($dataSet, null, 'A1');
+        $worksheet->getAutoFilter()->setRange('A1:C9');
+
+        $reloaded = $this->writeAndReload($spreadsheet, 'Ods');
+
+        self::assertSame('A1:C9', $reloaded->getActiveSheet()->getAutoFilter()->getRange());
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/Writer/Tcpdf/HideMergeTest.php b/tests/PhpSpreadsheetTests/Writer/Tcpdf/HideMergeTest.php
new file mode 100644
index 0000000000..7b8673489e
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Tcpdf/HideMergeTest.php
@@ -0,0 +1,127 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Tcpdf;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Alignment;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Color;
+use PhpOffice\PhpSpreadsheet\Writer\Pdf\Tcpdf;
+use PHPUnit\Framework\TestCase;
+
+class HideMergeTest extends TestCase
+{
+    public function testHideWithMerge(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        // just some labels for better visualisation of the problem
+        $worksheet->setCellValue('A1', 'A');
+        $worksheet->setCellValue('B1', 'B');
+        $worksheet->setCellValue('C1', 'C');
+        // setting the row height to better visualize the problem
+        for ($i = 1; $i <= 10; ++$i) {
+            $worksheet->getRowDimension($i)->setRowHeight(17);
+        }
+        // Headline - merged over two cells AND two rows
+        $worksheet->mergeCells('B2:C3');
+        $worksheet->setCellValue('B2', 'Hello World Headline');
+        $worksheet->getStyle('B2:C3')->getFont()->setBold(true);
+        $worksheet->getStyle('B2:C3')
+            ->getAlignment()
+            ->setHorizontal(Alignment::HORIZONTAL_CENTER);
+        $worksheet->getStyle('B2:C3')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 1 - merge over two rows
+        $worksheet->mergeCells('B4:B5');
+        $worksheet->mergeCells('C4:C5');
+        $worksheet->setCellValue('B4', 'Label 1');
+        $worksheet->setCellValue('C4', 'Text 1');
+        $worksheet->getStyle('B4:B5')->getFont()->setBold(true);
+        $worksheet->getStyle('B4:C5')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B4:B5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C4:C5')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // Content 2 - merge over two rows
+        $worksheet->mergeCells('B6:B7');
+        $worksheet->mergeCells('C6:C7');
+        $worksheet->setCellValue('B6', 'Label 2');
+        $worksheet->setCellValue('C6', 'Text 2');
+        $worksheet->getStyle('B6:B7')->getFont()->setBold(true);
+        $worksheet->getStyle('B6:C7')
+            ->getAlignment()
+            ->setVertical(Alignment::VERTICAL_CENTER);
+        $worksheet->getStyle('B6:B7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+        $worksheet->getStyle('C6:C7')
+            ->getBorders()
+            ->getAllBorders()
+            ->setBorderStyle(Border::BORDER_THIN)
+            ->setColor(new Color(Color::COLOR_BLACK));
+
+        // This is where the error was introduced (!!!)
+        $worksheet->getColumnDimension('A')->setVisible(false);
+        $Tcpdf = new Tcpdf($spreadsheet);
+        $html = $Tcpdf->generateHtmlAll();
+        $html = preg_replace('/^\\s+/m', '', $html) ?? $html;
+        $html = preg_replace('/[\\n\\r]/', '', $html) ?? $html;
+        self::assertStringContainsString(
+            '<tbody><tr style="height:17pt">'
+                . '<td></td>'
+                . '<td style="vertical-align:bottom; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp">B</td>'
+                . '<td style="vertical-align:bottom; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp">C</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr style="height:17pt">'
+                . '<td></td>'
+                . '<td style="vertical-align:bottom; text-align:center; border-bottom:1px solid #000000 !important; border-top:1px solid #000000 !important; border-left:1px solid #000000 !important; border-right:1px solid #000000 !important; font-weight:bold; color:#000000; font-family:\'Calibri\'; font-size:11pt; width:84pt; height:17pt" class="gridlines gridlinesp" colspan="2" rowspan="2">Hello World Headline</td>'
+                . '</tr>',
+            $html
+        );
+        $emptyRowCount = substr_count(
+            $html,
+            '<tr style="height:17pt">'
+                . '<td></td>'
+                . '</tr>'
+        );
+        self::assertSame(3, $emptyRowCount);
+        self::assertStringContainsString(
+            '<tr style="height:17pt">'
+                . '<td></td>'
+                . '<td style="vertical-align:middle; border-bottom:1px solid #000000 !important; border-top:1px solid #000000 !important; border-left:1px solid #000000 !important; border-right:1px solid #000000 !important; font-weight:bold; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp" rowspan="2">Label 1</td>'
+                . '<td style="vertical-align:middle; border-bottom:1px solid #000000 !important; border-top:1px solid #000000 !important; border-left:1px solid #000000 !important; border-right:1px solid #000000 !important; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp" rowspan="2">Text 1</td>'
+                . '</tr>',
+            $html
+        );
+        self::assertStringContainsString(
+            '<tr style="height:17pt">'
+                . '<td></td>'
+                . '<td style="vertical-align:middle; border-bottom:1px solid #000000 !important; border-top:1px solid #000000 !important; border-left:1px solid #000000 !important; border-right:1px solid #000000 !important; font-weight:bold; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp" rowspan="2">Label 2</td>'
+                . '<td style="vertical-align:middle; border-bottom:1px solid #000000 !important; border-top:1px solid #000000 !important; border-left:1px solid #000000 !important; border-right:1px solid #000000 !important; color:#000000; font-family:\'Calibri\'; font-size:11pt; text-align:left; width:42pt; height:17pt" class="gridlines gridlinesp" rowspan="2">Text 2</td>'
+                . '</tr>',
+            $html
+        );
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Writer/Xls/ParserTest.php b/tests/PhpSpreadsheetTests/Writer/Xls/ParserTest.php
index ac814b8ce3..9d10cdf10d 100644
--- a/tests/PhpSpreadsheetTests/Writer/Xls/ParserTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Xls/ParserTest.php
@@ -7,6 +7,7 @@
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Writer\Exception as WriterException;
 use PhpOffice\PhpSpreadsheet\Writer\Xls\Parser;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class ParserTest extends TestCase
@@ -54,4 +55,48 @@ public function testGoodParse(): void
         $parser = new Parser($this->spreadsheet);
         self::assertSame('1e01001e02001e0300', bin2hex($parser->toReversePolish(['left' => 1, 'right' => 2, 'value' => 3])));
     }
+
+    #[DataProvider('cellSheetnameQuotedProvider')]
+    public function testCellSheetnameQuoted(bool $expected, string $address): void
+    {
+        self::assertSame($expected, Parser::matchCellSheetnameQuoted($address));
+    }
+
+    public static function cellSheetnameQuotedProvider(): array
+    {
+        return [
+            [true, '\'TS GK Mustermann Hans 2\'!$N$1'],
+            [true, '\'TS GK Mustermann Hans 2\'!N15'],
+            [true, '\'TS GK Mus\'\'termann Hans 2\'!N15'],
+            [false, '\'TS GK Mus\'termann Hans 2\'!N15'],
+            [false, '\'TS GK Mustermann Hans 2\'!N15:P16'],
+            [false, '\'TS GK Mustermann Hans 2\'!$N$15:$P$16'],
+            [false, 'sheet1!N15'],
+            [false, 'sheet1!N15:P16'],
+            [false, 'N15'],
+            [false, 'N15:P16'],
+        ];
+    }
+
+    #[DataProvider('rangeSheetnameQuotedProvider')]
+    public function testRangeSheetnameQuoted(bool $expected, string $address): void
+    {
+        self::assertSame($expected, Parser::matchRangeSheetnameQuoted($address));
+    }
+
+    public static function rangeSheetnameQuotedProvider(): array
+    {
+        return [
+            [false, '\'TS GK Mustermann Hans 2\'!$N$1'],
+            [false, '\'TS GK Mustermann Hans 2\'!N15'],
+            [false, '\'TS GK Mus\'\'termann Hans 2\'!N15'],
+            [false, '\'TS GK Mus\'termann Hans 2\'!N15'],
+            [true, '\'TS GK Mustermann Hans 2\'!N15:P16'],
+            [true, '\'TS GK Mustermann Hans 2\'!$N$15:$P$16'],
+            [false, 'sheet1!N15'],
+            [false, 'sheet1!N15:P16'],
+            [false, 'N15'],
+            [false, 'N15:P16'],
+        ];
+    }
 }