Run results for: Regex vs Forloop Performance

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 5 months ago

RegEx

7.8M/s

For Loop

5.6M/s

View exact numbers

Test name	Executions per second
✓ RegEx	7,795,428 Ops/sec
For Loop	5,636,550 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]) } }