Comment by staticassertion

I don't see why switching to a new regex implementation would be so scary. 2 weeks to test that your regexes don't break seems fine? Seems like a long time tbh.

On top of that they're switching to more constrained regex engines. Rust's regex engine makes guarantees about its running time, something that would have directly mitigated a portion of the issue. And it isn't as if RE2/Rust regex aren't in use anywhere, rust's regex engine is integrated into vscode, for example.