Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:143.0) Gecko/20100101 Firefox/143.0

Browser: Firefox 143

Operating system: Linux

Device Platform: Desktop

Date tested: 9 months ago

use existing regex

12.1M/s

instantiate new regex

11.2M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	12,056,680 Ops/sec
instantiate new regex	11,201,991 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, "\\$&")