Run results for: how fast is regex?

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 4 months ago

Test name	Executions per second
instantiate new regex	526357984.0 Ops/sec
use existing regex	387899200.0 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, "\\$&")