Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; VTR-L09 Build/HUAWEIVTR-L09; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.101 Mobile Safari/537.36

Browser: Chrome Mobile 85

Operating system: Android

Device Platform: Mobile

Date tested: 9 months ago

use existing regex

1.1M/s

instantiate new regex

1.1M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	1,102,663 Ops/sec
instantiate new regex	1,063,701 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, "\\$&")