or download this
use Benchmark;
...
packstuffD: 11 wallclock secs (10.06 usr + 0.00 sys = 10.06 CPU) @ 99
+45.30/s (n=100000)
packstuffF: 10 wallclock secs (10.63 usr + 0.02 sys = 10.65 CPU) @ 93
+93.20/s (n=100000)
regex: 11 wallclock secs (11.01 usr + 0.01 sys = 11.02 CPU) @ 90
+77.71/s (n=100000)