Benchmark: Longer regex test vs string includes

Script Preparation code:

var string = "Helaas11111111111111111111111111111111111111111111111111111heljhell222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222333333333333343565555ghgfrdfdfdsfshellasdflasdkfjksadfksdflsdfjsdjlfjsdfkjadsfjakdsjfjsadlfklksdjflkjsdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddklllllllllllllllllllllllkkkkkkkkkkkkkkkkkkkjjjjjjjjjjjjjjjjjjjjjjjjjhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhdfgafsdfsfdsadfsadfsadsadgfdgaesssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssHello world!";
var regex = /Hello/;

Tests:

regex
regex.test(string);
includes
string.includes("Hello");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
includes

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

**Overview**

The provided JSON represents a benchmark test case on MeasureThat.net, which compares the performance of two approaches to search for a specific string within a large input string: regular expression (regex) and string includes.

**Benchmark Definition**

The benchmark definition is not explicitly stated in the provided code. However, based on the test cases, it appears that the benchmark is comparing the performance of two functions:

1. `string.includes("Hello")`: This function checks if the input string "Hello" is present anywhere within the larger input string.
2. `regex.test(string)`: This function uses a regular expression to search for the pattern "Hello" within the larger input string.

**Options Compared**

The benchmark compares two options:

1. **String Includes**: Uses the `includes()` method to search for the presence of the substring "Hello" in the input string.
2. **Regular Expression**: Uses a regex pattern `/Hello/` to search for the exact match of the substring "Hello" in the input string.

**Pros and Cons**

**String Includes:**

Pros:

* Simple and easy to understand
* Fast and efficient implementation

Cons:

* May not be suitable for searching complex patterns or regular expressions
* Can be slower than regex for large inputs due to the overhead of iteration

**Regular Expression:**

Pros:

* Powerful and flexible for searching complex patterns and regular expressions
* Can be faster than string includes for large inputs due to the optimized engine

Cons:

* More complex and harder to understand, especially for beginners
* May have slower performance due to the overhead of parsing and compiling the regex pattern

**Other Considerations**

* The input string is very large (333 characters), which may affect the performance of both options.
* The test case uses a modern browser (Chrome 119) with a relatively high clock speed, which may impact the results.

**Library and Purpose**

In this benchmark, no explicit library is used. However, the `includes()` method is a built-in JavaScript function that searches for the presence of a substring within an input string. The regex pattern `/Hello/` is a simple regular expression that matches the exact substring "Hello".

**Special JS Feature or Syntax**

This benchmark uses the `includes()` method and regular expressions (regex), which are standard features in modern JavaScript.

**Alternatives**

If you were to design a similar benchmark, you could consider additional options, such as:

* Using a different programming language or framework
* Incorporating more complex patterns or regular expressions
* Testing with different input sizes or distributions
* Adding additional performance metrics, such as memory usage or CPU utilization.

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
regex	5600986.0 Ops/sec
includes	19730324.0 Ops/sec

Related benchmarks:

Longer regex test vs string includes (version: 0)

Comparing performance of: regex vs includes

Created: 11 months ago by: Guest

Jump to the latest result

regex

includes

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):