pl@nereida:~/Lperltesting$ ./comparequotedstrings.pl
                Rate gpossessive  gbacktrack
gpossessive 569399/s          --        -14%
gbacktrack  665929/s         17%          --
            Rate  backtrack possessive
backtrack  163/s         --        -4%
possessive 169/s         4%         --
                  Rate  failgbacktrack failgpossessive
failgbacktrack  16.6/s              --            -97%
failgpossessive  583/s           3419%              --

pl@nereida:~/Lperltesting$ ./comparequotedstrings.pl
                Rate gpossessive  gbacktrack
gpossessive 588574/s          --        -15%
gbacktrack  694595/s         18%          --
            Rate  backtrack possessive
backtrack  164/s         --        -4%
possessive 171/s         4%         --
                  Rate  failgbacktrack failgpossessive
failgbacktrack  17.3/s              --            -97%
failgpossessive  583/s           3276%              --
            (warning: too few iterations for a reliable count)
                        s/iter failgpossessivenested  failgbacktracknested
failgpossessivenested     23.1                    --                 -100%
failgbacktracknested  4.42e-02                52042%