Benchmark: RegExp constructor vs literals, with variations

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}$/.test('132abc67219f019afe12901a');
}
const premadeLiteral = /^[0-9a-fA-F]{24}$/;
function getRePremadeLiteral() {
  return premadeLiteral.test('132abc67219f019afe12901a');
}
const premadeConstructor = new RegExp('^[0-9a-fA-F]{24}$');
function getRePremadeConstructor() {
  return premadeConstructor.test('132abc67219f019afe12901a');
}
const premadeConstructor2 = new RegExp(/^[0-9a-fA-F]{24}$/);
function getRePremadeConstructor2() {
  return premadeConstructor2.test('132abc67219f019afe12901a');
}

Tests:

new RegExp()
getReConstructor()
RegExp() factory
getReFactory()
Literal
getReLiteral()
Literal premade
getRePremadeLiteral()
Premade constructor
getRePremadeConstructor()
Premade constructor 2
getRePremadeConstructor2()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new RegExp()
RegExp() factory
Literal
Literal premade
Premade constructor
Premade constructor 2

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
new RegExp()	2716764.0 Ops/sec
RegExp() factory	2770801.0 Ops/sec
Literal	7673892.0 Ops/sec
Literal premade	7832212.0 Ops/sec
Premade constructor	7840323.0 Ops/sec
Premade constructor 2	7869571.0 Ops/sec

RegExp constructor vs literals, with variations (version: 0)

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

Comparing performance of: new RegExp() vs RegExp() factory vs Literal vs Literal premade vs Premade constructor vs Premade constructor 2

Created: one year ago by: Guest

Jump to the latest result

new RegExp()

RegExp() factory

Literal

Literal premade

Premade constructor

Premade constructor 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A