The regex crate actually has quite a bit of optimization, which is why it&#x27;s #1 on the benchmark game. In the OP, it looks like Rust is holding its own to me.<p>Just because Rust&#x27;s regexes use automata doesn&#x27;t mean they have to be slow. :-) It can be tricky to make them fast, but RE2 proves that it is possible!