Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 months ago

use existing regex

17.1M/s

instantiate new regex

15.2M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	17,083,796 Ops/sec
instantiate new regex	15,216,407 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, "\\$&")