Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; Mi 9T Build/QKQ1.190825.002; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.119 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/262.0.0.34.117;]

Browser: Chrome Mobile 80

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Regex	56895.8 Ops/sec
Split and Join	130085.1 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