Benchmark: Split vs Regex - MeasureThat.net

Script Preparation code:

var testString = "testing\nNewlines\nBleh"

Tests:

Splitting
var values = testString.split("\n"); var value1 = values[0]; var value2 = values[1]; var value3 = values[2];
Regex
var regex = /.+((?=\n)|$)/g var value1 = regex[0]; var value2 = regex[1]; var value3 = regex[2];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splitting
Regex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares two ways to process a string: using the `split()` method and regular expressions (Regex). The test case creates a sample string with multiple newlines (`\n`) and then measures the execution time of both methods to extract specific values from the string.

**Options Compared**

1. **Split() Method**: This method splits the input string into an array of substrings based on a specified separator (in this case, `\n`).
	* Pros:
		+ Easy to understand and use.
		+ Fast and efficient for simple cases.
	* Cons:
		+ Can be slow if the input string is large or if there are many separators.
2. **Regular Expressions (Regex)**: This method uses a pattern to search for matches in the input string and extracts specific values based on those matches.
	* Pros:
		+ Highly flexible and powerful for complex patterns.
		+ Can handle large input strings efficiently.
	* Cons:
		+ Steeper learning curve due to the complexity of regex syntax.
		+ Can be slower than split() for simple cases.

**Library Used**

None explicitly, but it's implied that JavaScript's built-in string manipulation functions are being used. However, if we were to compare with a dedicated library like `regex- escape`, it might provide better performance or additional features.

**Special JS Feature/Syntax (Not Applicable)**

There is no special JS feature or syntax mentioned in the benchmark definition or test cases.

**Other Considerations**

* The benchmark only tests two specific methods and does not account for other string processing techniques, such as `replace()` or `substring()`.
* It's essential to note that the choice of method depends on the specific use case and requirements. For example, if you need to extract values from a string with a complex pattern, regex might be a better choice.

**Alternatives**

Other alternatives for processing strings include:

1. **String.prototype.replace()**: This method replaces substrings in a string based on a specified pattern.
2. **String.prototype.substring()**: This method extracts a portion of a string based on start and end indices.
3. **Libraries like regex-escape**: These libraries provide optimized implementations for common regex patterns, which might offer better performance.

In summary, the benchmark compares two simple string processing methods: split() and regex. While the split() method is easy to use and efficient for simple cases, regex offers more flexibility but can be slower or require a steeper learning curve.

Latest run results:

Run details: (Test run date: 3 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser/OS: Firefox 132 on Linux

View result in a separate tab

Test name	Executions per second
Splitting	6527867.0 Ops/sec
Regex	122638904.0 Ops/sec

Related benchmarks:

Split vs Regex (version: 0)

Comparing performance of: Splitting vs Regex

Created: 5 years ago by: Guest

Jump to the latest result

Splitting

Regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):