diff --git a/bauh/gems/arch/pacman.py b/bauh/gems/arch/pacman.py
index 00cef089..e760f9e8 100644
--- a/bauh/gems/arch/pacman.py
+++ b/bauh/gems/arch/pacman.py
@@ -290,7 +290,7 @@ def read_repository_from_info(name: str) -> Optional[str]:
 
     repository = None
 
-    for o in new_subprocess(['grep', '-Po', "Repository\s+:\s+\K.+"], stdin=info.stdout).stdout:
+    for o in new_subprocess(['grep', '-Po', r"Repository\s+:\s+\K.+"], stdin=info.stdout).stdout:
         if o:
             line = o.decode().strip()
 
@@ -343,7 +343,7 @@ def read_provides(name: str) -> Set[str]:
 
     provides = None
 
-    for out in new_subprocess(['grep', '-Po', 'Provides\s+:\s\K(.+)'], stdin=dep_info.stdout).stdout:
+    for out in new_subprocess(['grep', '-Po', r'Provides\s+:\s\K(.+)'], stdin=dep_info.stdout).stdout:
         if out:
             provided_names = [p.strip() for p in out.decode().strip().split(' ') if p]
 
@@ -372,7 +372,7 @@ def read_dependencies(name: str) -> Set[str]:
         raise PackageNotFoundException(name)
 
     depends_on = set()
-    for out in new_subprocess(['grep', '-Po', 'Depends\s+On\s+:\s\K(.+)'], stdin=dep_info.stdout).stdout:
+    for out in new_subprocess(['grep', '-Po', r'Depends\s+On\s+:\s\K(.+)'], stdin=dep_info.stdout).stdout:
         if out:
             line = out.decode().strip()
 
diff --git a/bauh/gems/debian/index.py b/bauh/gems/debian/index.py
index b86f7941..aa8e587d 100644
--- a/bauh/gems/debian/index.py
+++ b/bauh/gems/debian/index.py
@@ -140,7 +140,7 @@ class ApplicationsMapper:
     def __init__(self, logger: Logger, workers: int = 10):
         self._log = logger
         self._re_desktop_file = re.compile(r'(.+):\s+(/usr/share/applications/.+\.desktop)')
-        self._re_desktop_file_fields = re.compile('(Exec|TryExec|Icon|Categories|NoDisplay|Terminal)\s*=\s*(.+)')
+        self._re_desktop_file_fields = re.compile(r'(Exec|TryExec|Icon|Categories|NoDisplay|Terminal)\s*=\s*(.+)')
         self._workers = workers
 
     def _read_file(self, file_path: str) -> Optional[str]:
diff --git a/bauh/gems/flatpak/flatpak.py b/bauh/gems/flatpak/flatpak.py
index bbb85113..5db55ec2 100755
--- a/bauh/gems/flatpak/flatpak.py
+++ b/bauh/gems/flatpak/flatpak.py
@@ -16,7 +16,7 @@
 
 RE_SEVERAL_SPACES = re.compile(r'\s+')
 RE_COMMIT = re.compile(r'(Latest commit|Commit)\s*:\s*(.+)')
-RE_REQUIRED_RUNTIME = re.compile(f'Required\s+runtime\s+.+\(([\w./]+)\)\s*.+\s+remote\s+([\w+./]+)')
+RE_REQUIRED_RUNTIME = re.compile(r'Required\s+runtime\s+.+\(([\w./]+)\)\s*.+\s+remote\s+([\w+./]+)')
 OPERATION_UPDATE_SYMBOLS = {'i', 'u'}