http://dlang.org/regular-expression.html
"In this particular case it matched roughly 50% faster for me though I haven't done comprehensive analysis of this case."
Needs a benchmark and results.
"Not to spoil the excitement, but as of this writing the feature is experimental and temporarily lacks some extensions. Continuing the gloomy trend, be warned that compiler might choke on it, and it's also less tested."
Needs clarification.
Also it needs update to use the new more intuitive API, in all of the examples.