Run results for: Unnecessary non-capturing groups

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

indexOf

215.6M/s

anotherUnneededNonCapture

12.7M/s

unneededNonCaptureRE

7.1M/s

noNonCaptureRE

7.0M/s

anotherNoNonCapture

5.8M/s

View exact numbers

Test name	Executions per second
✓ indexOf	215,629,744 Ops/sec
anotherUnneededNonCapture	12,675,217 Ops/sec
unneededNonCaptureRE	7,059,473 Ops/sec
noNonCaptureRE	7,018,906 Ops/sec
anotherNoNonCapture	5,793,600 Ops/sec

Script Preparation code:

var loremString = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
var unneededNonCaptureRE = /(?:z)+/
var noNonCaptureRE = /z+/
var anotherUnneededNonCapture = /lab(?:o)rum/
var anotherNoNonCapture = /laborum/

Tests: