Run results for: Unnecessary non-capturing groups

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 Edg/136.0.0.0

Browser: Chrome 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

indexOf

103.2M/s

anotherUnneededNonCapture

7.0M/s

anotherNoNonCapture

4.0M/s

noNonCaptureRE

3.8M/s

unneededNonCaptureRE

3.7M/s

View exact numbers

Test name	Executions per second
✓ indexOf	103,205,960 Ops/sec
anotherUnneededNonCapture	6,989,348 Ops/sec
anotherNoNonCapture	3,985,725 Ops/sec
noNonCaptureRE	3,813,553 Ops/sec
unneededNonCaptureRE	3,745,181 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: