Run results for: Multiple Replace vs. Single Regex Replace

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0

Browser: Firefox 92

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Single regex	14773222.0 Ops/sec
Double Replace	8677234.0 Ops/sec

Script Preparation code:

var string = "This is a test"

AخA
 
var string = "This is a test"

Tests:

Single regex
string = string.replace(/^[a-zA-Z]|\s+/g, "-")
string = string.replace(/^[a-zA-Z]|\s+/g, "-")
Double Replace
string = string.replace(/^[a-zA-Z]/g, "-").replace(/\s+/g, "-")
string = string.replace(/^[a-zA-Z]/g, "-").replace(/\s+/g, "-")