Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    charLimitErrorMsg = 'Oops!  The personal message can only be %l characters long. Please shorten your message.';
    
    msgStart = 'Oops!  The personal message can only be ';
    
    msgEnd = 'characters long. Please shorten your message.';
    
    rx = /%l/;
    
    repStr = '57';
    
    repInt = 57;
  };
</script>

Test runner

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charLimitErrorMsg.replace(rx, repInt);

charLimitErrorMsg.replace(rx, repStr);

msgStart + repInt + msgEnd;

msgStart + repStr + msgEnd;

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