Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

use existing regex

47.4M/s

instantiate new regex

45.7M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	47,427,700 Ops/sec
instantiate new regex	45,675,624 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, "\\$&")