Regexp vs. lastIndexOf() and substring()

JavaScript performance comparison

Test case created by Fabrizio

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var str    = "paragraphs put returns between paragraphs",
        substr = "raphs";
};
</script>

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Testing in unknown unknown
Test Ops/sec
Regexp
str = str.replace(new RegExp(substr + "$"), "");
pending…
lastIndexOf() and substring()
var lastindex = str.length - substr.length;

if (str.lastIndexOf(substr) === lastindex) {      
   str = str.substring(0, lastindex);              
}
pending…

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