Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 9; en-us; POCOPHONE F1 Build/PKQ1.180729.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.128 Mobile Safari/537.36 XiaoMi/MiuiBrowser/10.8.3-g

Browser: Chrome Mobile 61

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Regex	81037.9 Ops/sec
Split and Join	112464.1 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