Run results for: substring vs regex

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240

Browser: Chrome 42

Operating system: Windows

Device Platform: Other

Date tested: 5 years ago

Test name	Executions per second
substring	10804930.0 Ops/sec
regex	5617531.0 Ops/sec

Script Preparation code:

var location = "www.example.com";

Tests:

substring
var str=location; if (str.substring(0, 4)=="www.") str = str.substring(4);
regex
var str=location.replace(/^www\./,'');