Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; SM-G960U1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.143 Mobile Safari/537.36

Browser: Chrome Mobile 75

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Regex	62558.8 Ops/sec
Split and Join	122652.4 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