Benchmark: Regex tests Dani

Script Preparation code:

var reConstructor = new RegExp('^(([^<>()\\[\\]\\.,;:\\s@"]+(\\.[^<>()\\[\\]\\.,;:\\s@"]+)*)|(".+"))@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}])|(([a-zA-Z0-9\\-]+\\.)+[a-zA-Z]{2,}))$');
var reLiteral = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z0-9\-]+\.)+[a-zA-Z]{2,}))$/;

Tests:

new RegExp()
reConstructor.test('danimrthotmail.com')
Literal notation
reLiteral.test('danimrthotmail.com')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new RegExp()
Literal notation

Fastest: N/A

Slowest: N/A

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/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
new RegExp()	2798422.5 Ops/sec
Literal notation	2819462.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Overview**

The provided JSON represents a benchmark test case for JavaScript regex patterns using the MeasureThat.net platform. The goal is to compare the performance of two approaches: creating a new RegExp object with literal notation (`reLiteral`) versus creating one with constructor syntax (`new RegExp()`).

**Benchmark Definition**

The benchmark definition consists of two parts:

1. **Script Preparation Code**: This section defines a RegExp constructor and a literal RegExp expression, `reConstructor` and `reLiteral`, respectively.
2. **Html Preparation Code**: This section is empty.

**Individual Test Cases**

There are two individual test cases:

1. **new RegExp()**: Tests the performance of creating a new RegExp object with the constructor syntax.
	* Benchmark Definition: `reConstructor.test('danimrthotmail.com')`
2. **Literal notation**: Tests the performance of using literal notation to define the RegExp pattern.
	* Benchmark Definition: `reLiteral.test('danimrthotmail.com')`

**Performance Comparison**

The two approaches differ in how they define the RegExp pattern:

1. **Constructor Syntax (`new RegExp()`)**:
	* Pros:
		+ Can be used to define more complex patterns with multiple groups and options.
		+ Allows for dynamic pattern definition using variables or functions.
	* Cons:
		+ Can lead to slower performance due to the overhead of creating a new object and parsing the pattern string.
2. **Literal Notation (`reLiteral`)**:
	* Pros:
		+ Faster performance since it doesn't involve object creation and parsing.
		+ More concise and readable syntax for simple patterns.
	* Cons:
		+ Limited to defining simple patterns with only one group.

**Library**

There is no specific library used in this benchmark. The RegExp constructor and literal notation are built-in JavaScript features.

**JavaScript Feature**

There is no special JavaScript feature or syntax mentioned in the provided JSON.

**Other Alternatives**

If you need to test other approaches for creating or defining RegExp patterns, consider:

1. **RegExp.prototype.test()**: A more concise way to define and test RegExp patterns.
2. **Regex engine APIs**: Some browsers have built-in regex engines that provide additional features and performance benefits.

Keep in mind that the choice of approach depends on your specific use case and requirements. MeasureThat.net provides a convenient platform for comparing different JavaScript implementation details.

Related benchmarks:

Regex tests Dani (version: 0)

Comparing performance of: new RegExp() vs Literal notation

Created: one year ago by: Guest

Jump to the latest result

new RegExp()

Literal notation

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):