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Run results for:
Alphanumeric String
Check if a string only contains alpha-numeric characters.
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<iframe src="https://measurethat.net/Embed?id=556341" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0
Browser:
Firefox 130
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Regex
9.3M/s
charCodeAt
8.3M/s
View exact numbers
Test name
Executions per second
✓
Regex
9,260,575 Ops/sec
charCodeAt
8,310,012 Ops/sec
HTML Preparation code:
var string = "isAlphaNumeric091";
Script Preparation code:
var string = "isAlphaNumeric091";
Tests:
Regex
/^[a-z0-9]+$/i.test(string)
charCodeAt
function isAlphaNumeric(str) { for (let i = 0; i < str.length; i++) { let 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)