Run results for: Regex vs split/join with simple replace

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser: Chrome 78

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Regex	689663.3 Ops/sec
Split and Join	1138641.0 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, '-');
Split and Join
str.split('_').join('-');

Run results for: Regex vs split/join with simple replace

Regex

Split and Join