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#!/perl/bin/perl
#
...
    'reverse' => 'casethree',
    'susbtr_copy' => 'casefour',
});

# string length 2 * 10:
                 Rate     reverse       regex  substr_mod susbtr_copy
...
susbtr_copy 18.7/s        117%          --         -8%        -58%
regex       20.4/s        137%          9%          --        -54%
substr_mod  44.6/s        418%        139%        119%          --