Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36

Browser: Chrome 147

Operating system: Linux

Device Platform: Desktop

Date tested: 2 months ago

use existing regex

9.2M/s

instantiate new regex

9.1M/s

View exact numbers

Test name	Executions per second
✓ use existing regex	9,187,973 Ops/sec
instantiate new regex	9,063,463 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, "\\$&")