Benchmark: Take last part from URL (Regex vs split)

Script Preparation code:

var str = 'https://www.testsite.com/some-path/another-path/2019/my-amazing-page-name.html';

Tests:

Regex
str.replace(/^(.*[\\\/])/, '');
Split
str.split('/').pop();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Linux

View result in a separate tab

Test name	Executions per second
Regex	2417840.0 Ops/sec
Split	7390167.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested**

The provided JSON represents a JavaScript microbenchmark on the MeasureThat.net website, which compares two approaches to extract the last part from a URL: using regular expressions (`regex`) versus splitting the string by '/' (`split`).

**Options compared**

There are two options being compared:

1. **Regex**: Using the `replace()` method with a regular expression to remove the leading parts of the URL and keep only the last part.
2. **Split**: Using the `split()` method to split the URL into an array of parts and then taking the last element using `pop()`.

**Pros and Cons**

1. **Regex**:
	* Pros: Can be more flexible and powerful for complex pattern matching, but may have performance overhead due to the complexity of the regex engine.
	* Cons: May not work as expected for certain input formats (e.g., URLs with special characters), can be slower than `split()` in many cases.
2. **Split**:
	* Pros: Typically faster and more efficient than regex, works well for simple URL formats, and is widely supported by browsers.
	* Cons: May not work correctly if the URL has multiple consecutive slashes or other edge cases.

**Other considerations**

* The `str` variable is initialized with a specific URL string in the Script Preparation Code section. This ensures that both test cases use the same input data.
* There are no special JavaScript features or syntax being tested, so we can focus on the core functionality of each approach.
* Other alternatives to achieve this task might include using other string manipulation methods (e.g., `substring()`, `indexOf()`), but `regex` and `split()` are two common and widely used approaches.

**Library and its purpose**

In this benchmark, no external library is being used. The `replace()` method uses the built-in JavaScript regex engine to perform regular expression matching, while the `split()` method uses a simple string splitting algorithm to divide the input string into parts.

If we were using an external library for URL manipulation or parsing, it might involve additional dependencies and potential performance overhead.

Related benchmarks:

Take last part from URL (Regex vs split) (version: 0)

Comparing performance of: Regex vs Split

Created: 7 years ago by: Guest

Jump to the latest result

Regex

Split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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