Run results for: single regex vs double regex vs for loop

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 144

Operating system: Android

Device Platform: Mobile

Date tested: 5 months ago

for loop

1.1M/s

double regex

1.0M/s

regex combined

628K/s

View exact numbers

Test name	Executions per second
✓ for loop	1,067,895 Ops/sec
double regex	1,029,419 Ops/sec
regex combined	627,515 Ops/sec

Script Preparation code:

var str = 'aasd-asdasd-fegdfg-werwerwer-dsfsdfsdf-sadfsdfsdf-asd-asdasdasdasd-asdasdasd-dssdfhsd-dsfsdfsd-sdfsdfsdf';
var size = str.length;
var regexCombined = /(^.)|-/g;
var regexFirst = /^./
var regexDash = /-/g

Tests:

regex combined
return str.replace(regexCombined, (s) => s === '-' ? ' ' : s.toUpperCase())
double regex
return str.replace(regexDash, ' ').replace(regexFirst, s => s.toUpperCase())
for loop
var result = ''; var i = 0; var char = ''; for (i = 0; i < size; i++) { char = str[i]; if (i === 0) { result += char.toUpperCase(); } else { result += char === '-' ? ' ' : char ; } } return result