It's not really "missing" because it's not intended to be an exhaustive list of all possible approaches. :-) It is merely a list of the regex engines currently in use in the regex crate.
It's essentially the same as RE2. But with the addition of a full DFA and a public versioned API for each of the internal engines. See: https://blog.burntsushi.net/regex-internals/
The regex crate follows the RE2 tradition of not supporting features that aren't known how to implement efficiently.
It's essentially the same as RE2. But with the addition of a full DFA and a public versioned API for each of the internal engines. See: https://blog.burntsushi.net/regex-internals/
The regex crate follows the RE2 tradition of not supporting features that aren't known how to implement efficiently.