title: Regular expression library benchmarks
body: <p>I have been wondering about the performance of regular expression implementations lately, and have had a hard time coming up with much useful information. </p>
  
  <p>Its easy enough to benchmark browser/javascript regex performance (plenty of tools on the net). The javascript regex implementation in Chrome and Opera pretty much destroy every other major browser.</p>
  
  <p>But when it comes down to the fastest c++, java, c#, python, etc.. regex implementation, there aren't too many good benchmarks or comparisons.</p>
  
  <p>So, whats the fastest regex library out there with close to complete feature implementation? (not too concerned about back-references)</p>