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#!/usr/bin/perl
use strict;
...
    }
    return $str;
}

            Rate by_regex1 by_regex3     by_fh  by_index by_regex2
by_regex1 49.6/s        --      -52%      -75%      -81%      -83%
...
by_fh      199/s      301%       94%        --      -25%      -34%
by_index   266/s      437%      160%       34%        --      -11%
by_regex2  300/s      505%      192%       51%       13%        --