This is somewhat incorrect, as Rust doesn&#x27;t have a standard regex library. You&#x27;re likely thinking of burntsushi&#x27;s regex crate, which made its own decision to be Unicode-aware. There&#x27;s no reason that someone couldn&#x27;t come up with their own regex library (or fork burntsushi&#x27;s, or just wrap an existing C regex library) that works as you desire.