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

Benchmark: timing 100000000 iterations of double_grep, grep_and, looka
+head_grep...

...

lookahead_grep    :
24 wallclock secs (22.83 usr +  0.00 sys = 22.83 CPU) @ 4380585.25/s (
+n=100000000)