Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Linux

Device Platform: Desktop

Date tested: 3 months ago

use existing regex

38.9M/s

instantiate new regex

34.8M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	38,864,224 Ops/sec
instantiate new regex	34,790,376 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, "\\$&")