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; rv:109.0) Gecko/20100101 Firefox/117.0

Browser: Firefox 117

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

.indexOf

724.2M/s

regex case insensi

15.8M/s

includes

5.0M/s

regex case sensi

4.5M/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: