Run results for: Regex vs split/join

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 11021.42.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.53 Safari/537.36

Browser: Chrome 70

Operating system: Chrome OS 11021.42.2

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Regex	105710.7 Ops/sec
Split and Join	143088.3 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