Run results for: Regex vs startswith and slice

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0.1 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

starts with and slice

5.9M/s

Regex

5.8M/s

View exact numbers

Test name	Executions per second
✓ starts with and slice	5,938,906 Ops/sec
Regex	5,807,172 Ops/sec

Script Preparation code:

window.idregex = /^(?<type>investigation|surface|shared)(?<id>.*)$/
window.str = 'shared:dfhalsdkfjhasldfiuyo324987';

Tests:

Regex
const match = str.match(idregex) const type = match?.groups.type; const id = match?.groups.id
starts with and slice
const type = 'shared'; str.startsWith('investigations') str.startsWith('surfaces') str.startsWith(type) const id = str.slice('shared'.length)