Run results for: Check if an element contains a class name using a regular expression

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
loop	102862.0 Ops/sec
className	180466.5 Ops/sec

HTML Preparation code:


<div class='one two three four five six seven eight nine testClass hello_world' id='demoBlock'></div>

Script Preparation code:

var el = document.getElementById('demoBlock');

Tests:

loop
for (var i=0, l=el.classList.length; i<l; ++i) { if(/hello_[^\s]+/.test(el.classList[i])) { console.log('found') break; } }
className
if (/hello_[^\s]+/.test(el.className)) { console.log('found') }