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use Benchmark qw( cmpthese timethese );

...

    return $out;
}

horrid rx does not match string
       Rate   // qr/o   qr   /o
...
qr/o  752/s 483%   --  -0% -27%
qr    753/s 483%   0%   -- -27%
/o   1037/s 704%  38%  38%   --

horrid rx does not match string
       Rate   //   qr qr/o   /o
...
qr   62.7/s  41%   --  -1%  -4%
qr/o 63.0/s  42%   1%   --  -4%
/o   65.4/s  47%   4%   4%   --