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for( 30, 300, 3000, 30000 ) { 
    $s = 'x'x$_ . 'reg exp' . 'x'x$_; 
...
         Rate INDEX REGEX
INDEX  3530/s    --  -77%
REGEX 15077/s  327%    --

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for( 30, 300, 3000, 30000 ) { 
    $s = 'x'x$_ . 'reg exp' . 'x'x$_; 
...
         Rate REGEX INDEX
REGEX 10983/s    --  -26%
INDEX 14792/s   35%    --