Run results for: Regex vs String comparison

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: 3 months ago

Test name	Executions per second
Using string comparison	1147695.1 Ops/sec
Using regex	1019981.1 Ops/sec
Using array includes	1115549.6 Ops/sec

Tests:

Using string comparison
const contentType = 'application/json'; const match = contentType === 'application/json' || contentType === 'application/json; charset=utf-8'; console.log(match);
Using regex
const RE_CONTENT_TYPE_JSON = new RegExp('^application/json(; charset=utf-8)?$', 'i'); const contentType = 'application/json'; const match = RE_CONTENT_TYPE_JSON.test(contentType); console.log(match);
Using array includes
const contentType = 'application/json'; const match = ['application/json', 'application/json; charset=utf-8'].includes(contentType); console.log(match);

Run results for: Regex vs String comparison

Using string comparison

Using regex

Using array includes