Does not work for GUUID validation

[tawmoto]

Hello, it seems that it does not work for GUUID validation

const char* pattern = "^([0-9A-Fa-f]{8}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{4}[-][0-9A-Fa-f]{12})$";
int m = re_match(pattern, "CA761232-ED42-11CE-BACD-00AA0057B223");

This works with online tools https://regex101.com/r/hD8sJ8/3

Thank you

[ToriningenGames]

Disclaimer: I am not the maintainer.

Your regex contains quantifiers ({8} etc.). Currently, they are not supported (ref. Issues #18, #29).
For this reason, I'd expect your regex to fail. Issue #29 points to a fork that, while out of date, does support quantifiers. Or, while more tedious and harder to maintain, repeating the character group prior to the quantifier would work.

[monolifed]

It supports match length now. You can do it with a few matches

There is another fork that supports quantifiers: https://github.com/monolifed/tiny-regex-mod

[rurban]

My times branch also supports this.