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use strict;
use warnings;
...
Benchmark: timing 100000 iterations of for, grep...
  for:  5 wallclock secs ( 4.85 usr +  0.02 sys =  4.87 CPU) @ 20546.5
+4/s (n=100000)
  grep:  6 wallclock secs ( 5.16 usr +  0.00 sys =  5.16 CPU) @ 19387.
+36/s (n=100000)

use strict;
use warnings;
...
   C-ish:  9 wallclock secs ( 8.42 usr +  0.02 sys =  8.44 CPU) @ 118.
+46/s (n=1000)
   Perlish:  7 wallclock secs ( 6.67 usr +  0.06 sys =  6.73 CPU) @ 14
+8.61/s (n=1000)