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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Literal

12.7M/s

Literal premade

9.7M/s

RegExp() factory

5.8M/s

new RegExp()

5.7M/s

View exact numbers

Test name	Executions per second
✓ Literal	12,725,350 Ops/sec
Literal premade	9,663,493 Ops/sec
RegExp() factory	5,774,014 Ops/sec
new RegExp()	5,724,554 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