Run results for: Regex vs Forloop Performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Windows

Device Platform: Desktop

Date tested: 5 months ago

For Loop

4.8M/s

RegEx

3.2M/s

View exact numbers

Test name	Executions per second
✓ For Loop	4,801,748 Ops/sec
RegEx	3,248,043 Ops/sec

HTML Preparation code:

var string = "passw)odas4gsdfsdf";

Script Preparation code:

var string = "aaaaabbbbbccccddd";

Tests:

RegEx
var s = string.match(/([a-zA-Z])\1*/g)||[]; return s.map(function(itm){ return [itm.charAt(0), itm.length]; });
For Loop
var result = [[string[0], 1]] for(let i = 1; i < string.length; i++) { const char = string[i] const lastChar = result.at(-1) if(char === lastChar[0]){ lastChar[1] = lastChar[1] + 1 } else { result.push([char, 1]) } }