Run results for: Regex construction vs execution

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36 Edg/125.0.0.0

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: 5 months ago

Test name	Executions per second
simple literal compilation	115819416.0 Ops/sec
simple constructor compilation	4928293.0 Ops/sec
constructor compilation with capture	4269742.5 Ops/sec
literal compilation with capture	112784968.0 Ops/sec
Execute literal simple	6286743.0 Ops/sec
Execute literal with capture	7659912.5 Ops/sec

Script Preparation code:

var constructorSimple = new RegExp('^[0-9a-fA-F]{24}$');
var literalSimple = /^[0-9a-fA-F]{24}$/;
var constructorWithCapture = new RegExp('My phone number is (?<phone>\d{3}-\d{3}-\d{4}).', 'g');
var literalWithCapture = /My phone number is (?<phone>\d{3}-\d{3}-\d{4})./g;

Tests:

simple literal compilation
var testLiteralSimple = /^[0-9a-fA-F]{24}$/;
simple constructor compilation
var testConstructorSimple = new RegExp('^[0-9a-fA-F]{24}$');
constructor compilation with capture
var testConstructorWithCapture = new RegExp('My phone number is (?<phone>\d{3}-\d{3}-\d{4}).', 'g');
literal compilation with capture
var testLiteralWithCapture = /My phone number is (?<phone>\d{3}-\d{3}-\d{4})./g;
Execute literal simple
const result = literalSimple.exec('132abc67219f019afe12901a');
Execute literal with capture
const result = literalWithCapture.exec('My phone number is 555-123-4567.');

Run results for: Regex construction vs execution

Compare literal and string construction of Regex with exec() leverage a pattern with and without captures.

simple literal compilation

simple constructor compilation

constructor compilation with capture

literal compilation with capture

Execute literal simple

Execute literal with capture