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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36 Edg/86.0.622.63

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
new RegExp()	1714702.4 Ops/sec
RegExp() factory	1582947.9 Ops/sec
Literal	4185909.8 Ops/sec
Literal premade	2862876.2 Ops/sec

Script Preparation code:

function getReConstructor() {
  return new RegExp('^[0-9a-fA-F]{24}$').test('132abc67219f019afe12901a');
}
function getReFactory() {
  return RegExp('^[0-9a-fA-F]{24}$').test('132abc67219f019afe12901a');
}
function getReLiteral() {
  return /^[0-9a-fA-F]{24}$/.test('132abc67219f019afe12901a');
}
var premadeLiteral = /^[0-9a-fA-F]{24}$/;
function getRePremadeLiteral() {
  return premadeLiteral.test('132abc67219f019afe12901a');
}

Tests:

new RegExp()
getReConstructor()
RegExp() factory
getReFactory()
Literal
getReLiteral()
Literal premade
getRePremadeLiteral()

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

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

new RegExp()

RegExp() factory

Literal

Literal premade