Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; SAMSUNG SM-A520F) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/10.1 Chrome/71.0.3578.99 Mobile Safari/537.36

Browser: Chrome Mobile 71

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Regex	20121.9 Ops/sec
Split and Join	28671.8 Ops/sec

Script Preparation code:

var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxyAbcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';

Tests:

Regex
str.replace(/./g, "$&Z");
Split and Join
str.split('').join('Z') + 'Z';

Run results for: Regex vs split/join

Regex

Split and Join