feat: Add a new by_regex option.

[JeffFaer]

No description provided.

[1e0ng]

Thanks so much for this awesome change! Looking forward to this powerful feature in the new year.

[alzabo]

LGTM. Thanks!

[KatrinaHoffert]

Verrrry nice! I think this can actually resolve quite a few different issues that users have reported, thanks to how versatile regex is.

I kinda wonder if we should at some point support multi-line start stanzas, since as the options and their complexity grows, the keep-sorted start line is getting longer and longer.

[JeffFaer]

I kinda wonder if we should at some point support multi-line start stanzas, since as the options and their complexity grows, the keep-sorted start line is getting longer and longer.

I'm definitely in favor of supporting multi-line start stanzas. I think that'd be useful by itself even if we were to implement some sort of keep-sorted configuration scheme where you could name long, complicated start stanzas to be re-used across a project

[KatrinaHoffert]

Heh at those regex examples for function names. Should be interesting what monstrosities people will come up with trying to use regex to parse non-regular languages.