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#!/usr/bin/perl -w
# usage : ./this_script.pl input_file > captured_benchmarks
...
    }
}
);

Benchmark: timing 1000000 iterations of double_grep, grep_and, lookahe
+ad_grep...
double_grep: 11 wallclock secs ( 9.06 usr +  0.00 sys =  9.06 CPU) @ 1
+10350.92/s (n=1000000)
  grep_and:  8 wallclock secs ( 8.70 usr +  0.00 sys =  8.70 CPU) @ 11
+4902.91/s (n=1000000)
lookahead_grep: 21 wallclock secs (20.31 usr +  0.00 sys = 20.31 CPU) 
+@ 49231.98/s (n=1000000)