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Run results for:
Alphanumeric
The best approach to check if a string is alphanumeric (JavaScript)
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<iframe src="https://measurethat.net/Embed?id=579099" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Regex
21788476.0 Ops/sec
charCodeAt
38893104.0 Ops/sec
HTML Preparation code:
var string = "passw)odas4gsdfsdf";
Script Preparation code:
var string = "passw)odas4gsdfsdf";
Tests:
Regex
/^[a-z0-9]+$/i.test(string)
charCodeAt
function isAlphaNumeric(str) { var code, i, len; for (i = 0, len = str.length; i < len; i++) { code = str.charCodeAt(i); if (!(code > 47 && code < 58) && // numeric (0-9) !(code > 64 && code < 91) && // upper alpha (A-Z) !(code > 96 && code < 123)) { // lower alpha (a-z) return false; } } return true; }; isAlphaNumeric(string)