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use Benchmark 'cmpthese';

...
         Rate Loop   RE
Loop  40378/s   -- -71%
RE   137552/s 241%   --

$_ = 'foo bar' x 2000;

...
      Rate   RE Loop
RE   340/s   -- -32%
Loop 503/s  48%   -

$_ = 'fo ba' x 1000 . 'foo bar';

...
        Rate    RE  Loop
RE     901/s    --  -94%
Loop 14065/s 1461%    --