Run results for: Fastest way to do string includes string (ignoring locale)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

.indexOf

8.9M/s

includes

7.3M/s

regex case insensi

6.5M/s

regex case sensi

4.8M/s

View exact numbers

Script Preparation code:

window.myString = 'a looooooong string who knows how Long'
window.regexpI = new RegExp('long', 'i');
window.regexp = new RegExp('long');

Tests: