Regexp library benchmarks...
Since I don't have an account to reply there http://blog.rburchell.com/2011/12/why-i-avoid-qregexp-in-qt-4-and-so.html, I'll do it here.
Recently somebody benchmarked regexp libraries as potential candidates for use in CMake. Short version: PCRE was not exactly much faster than what is in CMake, re2 and TRE were magnitudes faster: [cmake-developers] Re: slow regex implementation in RegularExpression. This is the home of TRE: http://laurikari.net/tre/about/