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Run results for:
URL Origin: startsWith vs Regex various
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<iframe src="https://measurethat.net/Embed?id=566658" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Browser:
Chrome 130
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Regular Expression
20280320.0 Ops/sec
StartsWith
103737512.0 Ops/sec
Tests:
Regular Expression
const https = 'https://www.example.com'; const slash = '//www.example.com'; const www = 'www.example.com'; /^(?:https?:)?\/\/(?:www\.)?/.test(https); /^(?:https?:)?\/\/(?:www\.)?/.test(slash); /^(?:https?:)?\/\/(?:www\.)?/.test(www);
StartsWith
const https = 'https://www.example.com'; const slash = '//www.example.com'; const www = 'www.example.com'; if(https.startsWith('http') || https.startsWith('//') || https.startsWith('www.')) return null; if(slash.startsWith('http') || slash.startsWith('//') || slash.startsWith('www.')) return null; if(www.startsWith('http') || www.startsWith('//') || www.startsWith('www.'))return null;