Benchmark: str.match vs str.Split jllj lpk

Script Preparation code:

string = "This is a benchmark to test if matching a regex is faster that splitting a string";
regex = /\S+/gi;

Tests:

String.split
string.split(/|s/)
Regex.match
string.match(regex)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String.split
Regex.match

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/127.0.0.0 Safari/537.36 Edg/127.0.0.0

Browser/OS: Chrome 127 on Linux

View result in a separate tab

Test name	Executions per second
String.split	140448.9 Ops/sec
Regex.match	639814.1 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 provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark measures the performance difference between two string manipulation operations: `string.match()` with regular expressions (regex) against `string.split()`. The goal is to compare how fast each operation is for splitting a string at spaces.

**Script Preparation Code**

The script preparation code sets up the initial variables:

* `string`: a test string containing multiple words separated by spaces.
* `regex`: a regex pattern used in the `string.match()` method, which matches one or more non-space characters (`\\S+`) with the `i` flag for case-insensitive matching.

**Html Preparation Code**

There is no HTML preparation code provided, indicating that this benchmark focuses on JavaScript performance without considering other factors like DOM manipulation or UI rendering.

**Individual Test Cases**

The two test cases compare the performance of:

1. **String.split()**: using the `split()` method with a regex pattern (`/|\s/`).
2. **Regex.match()**: using the `match()` method with the predefined regex pattern (`regex`).

**Comparison of Options**

Here's a brief overview of each approach, their pros and cons:

1. **String.split()**
	* Pros:
		+ Often more efficient for simple string splitting tasks.
		+ Can be faster for very large strings since it doesn't create an array of matches like `match()` does.
	* Cons:
		+ Returns an array of matches, which might require additional processing or handling.
2. **Regex.match()**
	* Pros:
		+ More flexible and powerful for matching patterns, including regular expressions with groups, capturing, and flags.
		+ Can be faster when only one match is expected, as it avoids creating unnecessary arrays.
	* Cons:
		+ Can be slower due to the overhead of regex compilation and execution.

**Library Usage**

The benchmark uses the built-in `String.prototype.match()` method, which is a JavaScript standard library function. This method returns an array containing any matches or null if no match is found.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Considerations**

When choosing between these two approaches, consider the following:

* If you need to split strings at specific positions (e.g., whitespace), `String.split()` might be a better choice.
* If you need to perform more complex pattern matching (e.g., regex with groups or capturing), `Regex.match()` is likely a better option.

**Alternatives**

Other alternatives for string splitting or pattern matching include:

* Using `String.prototype.replace()` with a callback function
* Utilizing third-party libraries like jQuery's `$.trim()` or other regex-heavy tools
* Implementing custom implementation using arrays and loops

Keep in mind that the choice of method depends on your specific requirements, performance constraints, and language features.

Related benchmarks:

str.match vs str.Split jllj lpk (version: 0)

Test String.match with regex against String.split with string. We are splitting a string at the spaces.

Comparing performance of: String.split vs Regex.match

Created: one year ago by: Guest

Jump to the latest result

String.split

Regex.match

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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