Benchmark: Regex Character vs Character Group

Script Preparation code:

url1 = 'abc.com';
url2 = 'abc.com/';
url3 = 'abc.com///';
regex3 = new RegExp('\/+$');

sanitizeUrl1 = function(url) {
  return url.replace(/\/+$/, '');
}

sanitizeUrl2 = function(url) {
  return url.replace(/[/]+$/, '');
}

sanitizeUrl3 = function(url) {
  return url.replace(regex3, '');
}

Tests:

regex character
sanitizeUrl1(url1); sanitizeUrl1(url2); sanitizeUrl1(url3);
regex character group
sanitizeUrl2(url1); sanitizeUrl2(url2); sanitizeUrl2(url3);
Compiled regex
sanitizeUrl3(url1); sanitizeUrl3(url2); sanitizeUrl3(url3);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex character
regex character group
Compiled regex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition JSON**

The JSON represents a JavaScript microbenchmark that tests three different approaches to sanitizing URLs:

1. `sanitizeUrl1`: Uses regular expressions with forward slashes (`/`) as separators. The regular expression is defined in the "Script Preparation Code" section.
2. `sanitizeUrl2`: Uses character groups ( `[ ]` ) as separators.
3. `sanitizeUrl3`: Uses a compiled regular expression, which is likely created by the JavaScript engine itself.

**Options Compared**

The benchmark compares the performance of these three approaches:

* **Regular Expressions with Forward Slashes**: `sanitizeUrl1`
* **Character Groups**: `sanitizeUrl2`
* **Compiled Regular Expression**: `sanitizeUrl3`

**Pros and Cons**

Here's a brief summary of each approach:

1. **Regular Expressions with Forward Slashes (`/`)**:
	* Pros: Wide character set support, flexible patterns.
	* Cons: May be slower due to regex engine overhead.
2. **Character Groups ( `[ ]` )**:
	* Pros: Fast and lightweight, suitable for simple use cases.
	* Cons: Limited character set support, may not work with all characters.
3. **Compiled Regular Expression**:
	* Pros: Optimized by the JavaScript engine, potentially faster execution.
	* Cons: May require more complex setup and maintenance.

The benchmark likely aims to determine which approach is the fastest in terms of execution speed for URL sanitization.

**Library and Purpose**

There is no explicit library mentioned in the benchmark definition. However, regular expressions are a built-in feature of JavaScript, making them widely available.

**Special JS Features or Syntax**

None are explicitly mentioned.

**Other Considerations**

When running this benchmark, it's essential to consider factors like:

* **Input data**: The type and range of URLs used for testing can affect results.
* **JavaScript Engine**: Different engines (e.g., V8, SpiderMonkey) may optimize compilation or execution differently.
* **Browser Extensions**: Any active browser extensions might interfere with the benchmark.

**Alternative Approaches**

Some alternative approaches to URL sanitization could be explored:

1. Using a dedicated library like `url-regex` or `sanitize-url`.
2. Implementing a custom sanitizer function using bitwise operations or string manipulation techniques.
3. Using a different separator, such as ASCII whitespace characters (`\s`) instead of forward slashes.

Keep in mind that these alternatives may not provide significant performance improvements over the benchmarked approaches and might require additional development effort.

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Browser/OS: Chrome 63 on Windows

View result in a separate tab

Test name	Executions per second
regex character	639528.6 Ops/sec
regex character group	610928.7 Ops/sec
Compiled regex	481836.2 Ops/sec

Related benchmarks:

Regex Character vs Character Group (version: 0)

Comparing performance of: regex character vs regex character group vs Compiled regex

Created: 6 years ago by: Guest

Jump to the latest result

regex character

regex character group

Compiled regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):