Regex Performance Testing

JavaScript performance comparison

Revision 2 of this test case created by Levi Hackwith

Info

How much faster is a precompiled regex vs a non-precompiled regex?

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var preCompiledReplaceRegex = /test/g;
   
    myHtml = "<span>This is a test</span><div>Of a regex</div><p>test</p><em>test</em>";
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Precompiled Regex (Replace)
myHtml.replace(preCompiledReplaceRegex, 'kittens');
pending…
Non-Precompiled Regex (Replace)
myHtml.replace(/test/g, "kittens");
pending…

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