perl5.8.7 ~/work/perl-bench/grep-vs-first.pl 1000 1000
Benchmark: running Grep, Util for at least 1 CPU seconds...
      Grep:  2 wallclock secs ( 1.05 usr +  0.00 sys =  1.05 CPU) @ 1358.70/s (n=1433)
      Util:  1 wallclock secs ( 1.07 usr +  0.01 sys =  1.08 CPU) @ 1876.41/s (n=2023)