Run results for: Regex vs split/join

Run details:

User agent: Xiaomi_M1805D1ST_TD-LTE/V1 Linux/3.18.71 Android/8.1 Release/4.10.2018 Browser/AppleWebKit537.36 Mobile Safari/537.36 System/Android 8.1 XiaoMi/MiuiBrowser/9.5.6

Browser: Android 8

Operating system: Android 8.1

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Regex	26596.8 Ops/sec
Split and Join	29775.7 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