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          Rate  regex substr
regex  21775/s     --   -27%
substr 29748/s    37%     --

$str='a'x1E6; 
=>
...
         Rate  regex substr
regex  1.41/s     --   -21%
substr 1.79/s    27%     --

       s/iter  regex substr
regex    1.80     --   -21%
substr   1.42    27%     --