Benchmark: Very simple regex vs string split

Script Preparation code:

string = "756B31_SOMEWORD";
regex = /^([a-zA-Z0-9]+)(?:_SOMETHING|_SOMEWORD|_SOMEOTHERWORD)$/;

Tests:

Split
string.split("_")[0]
Match
string.match(regex)[1]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Match

Fastest: N/A

Slowest: N/A

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

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Let's break down the provided benchmark JSON and explain what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark measures two different approaches to process a string: using regular expressions (`regex`) versus string splitting (`string.split()`).

* The script preparation code defines a sample string `string` with a specific pattern (`756B31_SOMEWORD`) and a regex pattern `regex` that matches strings containing `_SOMETHING`, `_SOMEWORD`, or `_SOMEOTHERWORD`.
* The HTML preparation code is empty, which means no additional setup is required for the benchmark.

**Individual Test Cases**

There are two test cases:

1. **Split**: Measures the execution time of `string.split("_")[0]`, which splits the original string at the first underscore character and takes the first part.
2. **Match**: Measures the execution time of `string.match(regex)[1]`, which attempts to match the regex pattern against the original string and returns the first capturing group (i.e., the matched value without the leading `_`).

**Comparison Options**

The benchmark compares two approaches:

* **Regex-based approach**: Uses a regular expression to match the string pattern. This involves:
	+ Creating a regex pattern (`regex`) that matches the desired string structure.
	+ Applying this pattern to the original string using `string.match(regex)`.
	+ Returning the first capturing group (i.e., the matched value without the leading `_`).
* **String splitting approach**: Splits the original string at each underscore character using `string.split("_")`, and then takes the first part.

**Pros and Cons of Each Approach**

* **Regex-based approach:**
	+ Pros:
		- Can be more flexible and powerful for complex pattern matching.
		- Can handle multiple patterns with different modifiers (e.g., `^` for start-of-string, `$` for end-of-string).
	+ Cons:
		- Can be slower due to the overhead of compiling and executing regex patterns.
		- May have performance issues if the input string is very large or contains many non-matching characters.
* **String splitting approach:**
	+ Pros:
		- Typically faster, as it avoids the overhead of regex pattern compilation and execution.
		- Can be simpler to implement and understand for simple patterns.
	+ Cons:
		- May not be suitable for complex patterns or edge cases.

**Library/External Dependency**

The benchmark uses JavaScript's built-in `String.prototype.match()` method, which is part of the ECMAScript standard. This function takes a regex pattern as an argument and returns an array of matching values or null if no match is found.

**Special JS Feature/Syntax**

There are no special JS features or syntax used in this benchmark. The focus is on comparing two simple string processing techniques using JavaScript's built-in methods.

**Alternatives**

Other alternatives for string splitting could include:

* Using a library like `lodash` or `string-prompt`, which provide optimized and flexible string manipulation functions.
* Implementing custom string splitting logic using JavaScript loops and conditional statements.
* Using other programming languages or libraries that offer efficient string processing capabilities (e.g., Python's `re` module or Java's `String.split()` method).

Keep in mind that the benchmark is focused on comparing two simple approaches, so these alternatives are not explicitly tested here. However, they may be worth exploring for more complex use cases or performance-critical applications.

Related benchmarks:

Very simple regex vs string split (version: 0)

Comparing performance of: Split vs Match

Created: 3 years ago by: Guest

Jump to the latest result

Split

Match

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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