Case-insensitive string matching

JavaScript performance comparison

Revision 3 of this test case created by dzdrazil

Info

Compares the use of regular expressions and toLowerCase methods for case-insensitive string matching.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    // prevent inline optimizations
    var rand = Math.floor((Math.random()*100000)+1);
   
    // search terms
    var needle = '' + rand + "some";
    var haystack = '' + rand + "Something";
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Regular expression
var match = (new RegExp(needle, 'i').test(haystack));
pending…
toLowerCase
var match = (haystack.toLowerCase().indexOf(needle.toLowerCase()) != -1);
pending…

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