Run results for: RegExp constructor vs literal vs premade, constructing in function

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36

Browser: Chrome 75

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
new RegExp()	2303558.2 Ops/sec
RegExp() factory	2289734.5 Ops/sec
Literal	6298522.5 Ops/sec
Literal premade	4268108.5 Ops/sec

Script Preparation code:

function getReConstructor() {
  return new RegExp('^[0-9a-fA-F]{24}$');
}
function getReFactory() {
  return RegExp('^[0-9a-fA-F]{24}$');
}
function getReLiteral() {
  return /^[0-9a-fA-F]{24}$/;
}
var premadeLiteral = /^[0-9a-fA-F]{24}$/;
function getRePremadeLiteral() {
  return premadeLiteral;
}

Tests:

new RegExp()
getReConstructor().test('132abc67219f019afe12901a')
RegExp() factory
getReFactory().test('132abc67219f019afe12901a')
Literal
getReLiteral().test('132abc67219f019afe12901a')
Literal premade
getRePremadeLiteral().test('132abc67219f019afe12901a')

Run results for: RegExp constructor vs literal vs premade, constructing in function

Testing performance when using a new RegExp object vs a literal regex

new RegExp()

RegExp() factory

Literal

Literal premade