Performance tests needed

[crawfordcomeaux]

Even if the regexes produced are optimized, it'll still be worth doing. If possible, a guide for how to write perf tests would be helpful, too.

Are there any recommended ways to do perf testing in the repo or is externally on jsperf the only good option?

[Nepoxx]

After the regex is generated, the performance should be identical to "regular" regexes. A small overhead could exist (I haven't checked the source), so maybe a benchmark folder could be useful.