Here's some output on many Perls :)
perlbrew exec bench_script.pl
perl-5.10.1
==========
Rate regex index split filehandle
regex 3.95/s -- -7% -40% -53%
index 4.27/s 8% -- -35% -50%
split 6.54/s 66% 53% -- -23%
filehandle 8.46/s 114% 98% 29% --
perl-5.12.5
==========
Rate index regex split filehandle
index 3.96/s -- -10% -39% -49%
regex 4.41/s 11% -- -32% -43%
split 6.50/s 64% 47% -- -16%
filehandle 7.69/s 94% 74% 18% --
perl-5.14.4
==========
Rate index regex split filehandle
index 3.67/s -- -14% -47% -49%
regex 4.25/s 16% -- -38% -41%
split 6.86/s 87% 62% -- -5%
filehandle 7.25/s 97% 71% 6% --
perl-5.16.3
==========
Rate index regex filehandle split
index 3.23/s -- -19% -45% -50%
regex 3.98/s 23% -- -32% -38%
filehandle 5.83/s 81% 46% -- -9%
split 6.44/s 100% 62% 10% --
perl-5.18.4
==========
Rate index regex split filehandle
index 3.62/s -- -1% -45% -46%
regex 3.65/s 1% -- -44% -46%
split 6.57/s 82% 80% -- -3%
filehandle 6.76/s 87% 85% 3% --
perl-5.20.3
==========
Rate index regex split filehandle
index 3.50/s -- -10% -44% -45%
regex 3.90/s 11% -- -38% -38%
split 6.25/s 79% 60% -- -1%
filehandle 6.31/s 80% 62% 1% --
perl-5.22.3
==========
Rate index regex split filehandle
index 3.62/s -- -0% -38% -48%
regex 3.64/s 0% -- -38% -47%
split 5.88/s 63% 62% -- -15%
filehandle 6.90/s 91% 90% 17% --
perl-5.24.1
==========
Rate regex index filehandle split
regex 2.97/s -- -21% -42% -59%
index 3.77/s 27% -- -26% -47%
filehandle 5.08/s 71% 35% -- -29%
split 7.18/s 142% 90% 41% --
perl-5.26.0
==========
Rate index regex split filehandle
index 3.00/s -- -25% -49% -53%
regex 3.98/s 33% -- -33% -37%
split 5.91/s 97% 49% -- -6%
filehandle 6.31/s 111% 59% 7% --
