Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (Android 16; Mobile; rv:146.0) Gecko/146.0 Firefox/146.0

Browser: Firefox Mobile 146

Operating system: Android

Device Platform: Mobile

Date tested: 7 months ago

instantiate new regex

25.3M/s

use existing regex

18.0M/s

View exact numbers

Test name	Executions per second
✓ instantiate new regex	25,259,264 Ops/sec
use existing regex	17,972,264 Ops/sec

Script Preparation code:

const prepared = /[.*+?^${}()|[\]\\]/g;

Tests:

instantiate new regex
const blah = "whatever" const r = blah.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")
use existing regex
const blah = "whatever" const r = blah.replace(prepared, "\\$&")