C:\test>1039228.pl
        Rate  regex    buk    cpp      c
regex 4.06/s     --   -97%   -99%  -100%
buk    137/s  3277%     --   -75%   -85%
cpp    546/s 13345%   298%     --   -40%
c      915/s 22446%   568%    68%     --