$ perl /tmp/compare.pl 
                         Rate regex_alter_catch regex_alter_nocatch regex_class equal
regex_alter_catch   1286220/s                --                -29%        -41%  -63%
regex_alter_nocatch 1803742/s               40%                  --        -17%  -48%
regex_class         2163145/s               68%                 20%          --  -37%
equal               3442791/s              168%                 91%         59%    --