Sugar for case-insensitive tokens?

[rodya-mirov]

I wonder if you would consider adding some syntactic sugar procedural macros for "case insensitive tokens" -- the way we have #[token("foo")], if we want to match Foo and FOO and fOo then we need #[regex("[Ff][Oo][Oo]")].

It's not a huge deal, but (e.g.) if you're lexing a DSL with lots of keywords, all of which are case-insensitive, it becomes a lot of typing (opportunity for mistakes) and much harder to read.

[maciejhirsz]

You can set the case insensitive flag on a group: (?i:foo): https://regex101.com/r/M8YjZ2/1

[rodya-mirov]

Wow, there's so much I don't know about regular expressions. Thank you!