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use strict;
use warnings;
...
__DATA__
This string contains foo and bar for fools and bards
and I pity the foo who bars the way

               Rate         map        loop alternation
map         14977/s          --         -6%        -25%
...
loop_s 17436/s     --   -37%
alt_s  27643/s    59%     --

use strict; 
use Benchmark 'cmpthese';
...
    for (1.. $count) { $string.=chr(ord('a')+rand(20)) } 
    return $string; 
}

Stringlength: 1000
Number of Regexes:10
...
      Rate   alt   for
alt 12.7/s    --  -98%
for  676/s 5209%    --