Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/80.0.3987.87 Chrome/80.0.3987.87 Safari/537.36

Browser: Chromium 80

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Regex	54507.8 Ops/sec
Split and Join	103797.3 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