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Run results for:
RegExp constructor vs literal (re-do creation)
Testing performance when using a new RegExp object vs a literal regex
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<iframe src="https://measurethat.net/Embed?id=504760" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Literal
405.9M/s
new RegExp()
9.7M/s
View exact numbers
Test name
Executions per second
✓
Literal
405,860,384 Ops/sec
new RegExp()
9,701,429 Ops/sec
Script Preparation code:
var reConstructor = new RegExp('^[0-9a-fA-F]{24}$') var reLiteral = /^[0-9a-fA-F]{24}$/
Tests:
new RegExp()
(new RegExp('^[0-9a-fA-F]{24}$')).test('132abc67219f019afe12901a')
Literal
/^[0-9a-fA-F]{24}$/.test('132abc67219f019afe12901a')