Can't match case insensitive with builtins.match

[Libadoxon]

Is your feature request related to a problem? Please describe.
You can't match case insensitive with builtins.match, I think nix uses ECMAScript regex which doesn't support pearl extensions like (?i). In c++ you can pass additional arguments to std::regex pattern() to make it match case insensitive, for example:

std::regex pattern("Some Pattern", std::regex_constants::icase);

But to my knowledge you can't pass anything to builtins.match except for the pattern/expression

Describe the solution you'd like
Make builtins.match support the pearl extensions

Describe alternatives you've considered
Allow passing of additional arguments to std::regex pattern()

Priorities

Add 👍 to issues you find important.

[fricklerhandwerk]

Triaged in Nix team meeting:

• @edolstra: this would require a notion of case, which goes into character sets. Overall an "interesting" problem
• @roberth: also a reproducibility hazard because of locales
• closing, the effort-value ratio is questionable. if many people want it, we can take a look again; would need a concrete proposal how it should work

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/2024-05-15-nix-team-meeting-minutes-146/45491/1