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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% --
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% --