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Yes, the `regex` crate is also the regex engine used by ripgrep, both were developed by https://github.com/burntsushi.

As others have pointed out, the regex engine is the same so the benefits would trickle downstream. For example, VSCode also uses ripgrep and therefore the rust-lang/regex engine.

ripgrep plugged this gap a long time ago by providing PCRE2 support.

PCRE2 supports only bounded length lookbehinds. It is true, it is not a big improvement to have unbounded ones in rust-lang/regex, but it still feels like something.

Pretty minor IMO. And PCRE2 supports lots of other stuff beside look-behinds.

Same engine as ripgrep