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  1. or download this
    c:\@Work\Perl\monks>perl -wMstrict -le
    "use Benchmark qw(cmpthese);
    ...
    /i       3276565/s       --      -8%      -9%
    [Aa]{2}  3558515/s       9%       --      -1%
    [Aa][Aa] 3600879/s      10%       1%       --
    
  2. or download this
    c:\@Work\Perl>perl -wMstrict -le
    "(source code as above)
    ...
    [Aa]{2}  3276565/s       --      -6%     -16%
    /i       3480139/s       6%       --     -11%
    [Aa][Aa] 3918166/s      20%      13%       --