Yes, several of the optimizations of the dynamic regexes aren't available in the compile-time version. (It doesn't even have a DFA, IIRC.) There is [a lint][1]

Yes, several of the optimizations of the dynamic regexes aren't available in the compile-time version. (It doesn't even have a DFA, IIRC.) There is [a lint][1] which checks that your regular expressions are valid (at compile time), though. [1]: https://github.com/Manishearth/rust-clippy/wiki#invalid_regex https://github.com/Manishearth/rust-clippy/wiki#invalid_rege...