Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var a=" fsfsd   fdfsd  ";
    
    var r1 = new RegExp('abc', 'g');
    var r2 = new RegExp('fds', 'g');
  };
</script>

Test runner

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var t1=a.replace(/abc|fds|gfgfe/g, '');

var t2=a.replace(r1, '').replace(r2, '');

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