Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_8_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.7 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.8.4

Device Platform: Mobile

Date tested: 9 months ago

use existing regex

30.9M/s

instantiate new regex

19.4M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	30,937,948 Ops/sec
instantiate new regex	19,407,704 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, "\\$&")