Illegal Capacity Argument Exception Raised

[rmabb123]

Stacktrace generated with the following regex:

String pp = "[\\i-[:]][\\c-[:]]*";
RgxGen rgxGen = new RgxGen(pp);

Generates:
java.lang.IllegalArgumentException: Illegal Capacity: -13

Using the online regex testing https://regex101.com
The following is valid: \\:\\:c:

RgxGen Version :1.4
OpenJDK 17

[FWDekker]

Do you mean String pp = "[\\i-[:]][\\c-[:]]*"; or String pp = "[\\\\i-[:]][\\\\c-[:]]*";?

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I don't think your regex is valid.

If I ask regex101 about [\i-[:]][\c-[:]]*, I get two errors:

1. \i This token has no special meaning and has thus been rendered erroneous
2. - Character range is out of order

And if I ask regex101 about [\\i-[:]][\\c-[:]]*, I also get two errors:

1. - Character range is out of order
2. - Character range is out of order

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The "Illegal capacity" error in RgxGen also means "Character range is out of order". For example, asking RgxGen to generate [z-a] gives "Illegal Capacity: -24".

[rmabb123]

When testing with regex101 using [\\i-[:]][\\c-[:]]*, you need to ensure you have selected "Java 8" as the flavor.
If you try testing with any of the other flavors, then you do indeed get an error.

[FWDekker]

Ah I see. RgxGen's supported syntax is not complete, but for what it's worth I think you can use [\\i\-:][\\c\-:]* instead.

[rmabb123]

I see two issues:

• The "-" is being treated as a range when it should be just another char (the original issue) because it comes are the end of a group (the next char is an unescape "[" which is the start or a new inner grouping)
• If you remove the hyphen, then it still fails because it does not recognise the "[:]" as being another char

Yes, your version does work but as you say "the supported syntax is not complete"