The 11000 LOC regex engine runs against the original regex engine test suite. I don't know the latest census, but it was quite good actually.

The parser is also quite good by now. Perl5 had to bootstrap pperl with parsing in the beginning, but not anymore.

The AI tar pits are real. "We'll use the regex crate - it will be fine." And me being like: "No."

OTOH, the AI kept telling me that I'm absolutely right, so it must be good. ;-)