\s\s*

JavaScript performance comparison

Revision 7 of this test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
var arr;
window.onload=function(){ arr = document.documentElement.innerHTML.replace(/>/g,"<").split("<"); }
var singleRegexp = /^\s+|\s+$/g;
var doubleRegexp0 = /^\s+/;
var doubleRegexp1 = /\s+$/;
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
1 regex
for(var idx =0;idx<arr.length;idx++)
  arr[idx].replace(singleRegexp , '');
pending…
2 regexes
for(var idx =0;idx<arr.length;idx++)
  arr[idx].replace(doubleRegexp0, '').replace(doubleRegexp1, '')
pending…
2 regexes (rev)
for(var idx =0;idx<arr.length;idx++)
  arr[idx].replace(doubleRegexp1, '').replace(doubleRegexp0, '')
pending…
1 regex recreated
for(var idx =0;idx<arr.length;idx++)
  arr[idx].replace(/^\s+|\s+$/g, '');
pending…
jQuery $.trim()
for(var idx =0;idx<arr.length;idx++)
  $.trim(arr[idx]);
pending…

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