Benchmark: A Spl vs Regx - MeasureThat.net

Script Preparation code:

const urlPath = "/aaa/bbbb/ccccc/dddddd/eeeeeee"

function regspl() {
  if (urlPath === "/") {
    return [""];
  } else {
    const regex = /[^\/]+/g;
    return urlPath.match(regex) || [""];
  }
}

function nmsplit() {
 	return urlPath.split('/').filter(Boolean);
}

Tests:

Split
nmsplit()
Regex
regspl()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
Split	7941237.0 Ops/sec
Regex	8127405.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to split a URL path into an array of segments: Regular Expression (Regx) and Non-RegEx (Nmsplit).

**Script Preparation Code**

The script preparation code defines two functions:

1. `regspl()`: This function uses a regular expression to split the URL path into an array of segments. The regular expression `/[^\\/]+/g` matches one or more characters that are not forward slashes (`/`). The `g` flag at the end makes the regex match all occurrences in the string, not just the first one.
2. `nmsplit()`: This function uses the built-in `split()` method to split the URL path into an array of segments. It then filters out any empty strings from the resulting array using the `filter(Boolean)` method.

**Library and Special JS Feature**

There is no explicit library mentioned in the script preparation code. However, it's worth noting that the regular expression `/[^\\/]+/g` uses a special regex feature called "global" (`g`) flag, which makes the regex match all occurrences in the string.

**Pros and Cons of Each Approach**

1. **Regx (Regular Expression)**:
	* Pros:
		+ Can be faster for certain types of input data.
		+ Allows for more complex splitting logic using regular expressions.
	* Cons:
		+ Can be slower than non-regex approaches for very large input data.
		+ May be less intuitive to read and maintain for developers without regex experience.
2. **Nmsplit (Non-RegEx)**:
	* Pros:
		+ Typically faster and more memory-efficient than regex-based approaches.
		+ Easier to understand and maintain for developers without regex experience.
	* Cons:
		+ May not work correctly for certain types of input data that don't match the expected pattern.

**Other Considerations**

When choosing between these two approaches, consider the following:

* What is the typical size and complexity of the URL paths you'll be working with?
* Do you need to support edge cases or special characters in the URL path?
* How important is code readability and maintainability to your team?

**Alternatives**

If you don't have access to the `split()` method, alternative approaches could include:

1. Using a custom loop to iterate over each character of the input string and build an array of segments.
2. Using a different regex flavor that's optimized for speed or memory usage.

However, without more information about the specific requirements and constraints of your project, it's difficult to recommend an alternative approach.

Related benchmarks:

A Spl vs Regx (version: 0)

Comparing performance of: Split vs Regex

Created: one year ago by: Guest

Jump to the latest result

Split

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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