chore: try enable regexp eslint rules

[antfu]

To give a quick overview of how these rules would affect our repo.

• Related: Include eslint-plugin-regexp in tooling preset eslint#432

Commits:

• The first commit b194048 only set up the rules
• 8d8a72d runs an autofix
• 26177e4 and cbc0d55 I fixes the regexes manually

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[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/ignore@5.3.1	None	0	51.5 kB	kael
npm/jiti@1.21.0	environment, filesystem, unsafe	0	1.91 MB	pi0

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[danielroe]

This looks solid to me - thank you so much! - and I'm happy to go ahead and merge if you like, so we don't end up with a PR that will be tricky to resolve conflicts on later 🙏