Benchmark: split vs match with regex

Script Preparation code:

string = ">,Z1mW@)cA:qNobPnSb`";
regex = /:(.+)/;

Tests:

split
string.split(regex)
match
string.match(regex)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
match

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
split	5296571.5 Ops/sec
match	5724006.5 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 and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to search for patterns in strings: `string.split()` and `string.match()`. These methods are used to find occurrences of a pattern within a string.

**What's being compared?**

* `split()`:
	+ Splits the input string into an array of substrings, using the pattern as the separator.
	+ Returns an array of matches, where each match is the part of the original string before and after the separator.
* `match()`:
	+ Returns a match object if the pattern is found at the beginning of the string.
	+ If no match is found, it returns null.

**Options compared**

The benchmark compares these two options:

1. **Splitting strings using regex**: The `split()` method uses the `regex` pattern to split the input string into substrings.
2. **Using match() with regex**: The `match()` method uses the same `regex` pattern to search for a match at the beginning of the string.

**Pros and Cons**

* **Splitting strings using regex:**
	+ Pros:
		- Can be more efficient if you need to process multiple matches or perform additional operations on each match.
		- Can handle multi-line strings by specifying `g` flag in the regex pattern.
	+ Cons:
		- May not be suitable for cases where you only need a single match, as it returns an array of matches.
		- Requires more memory to store the resulting array of matches.
* **Using match() with regex:**
	+ Pros:
		- Returns a match object that contains the matched text and its position in the string.
		- More memory-efficient than splitting strings, as only a single match is returned.
	+ Cons:
		- May not be suitable for cases where you need to process multiple matches or perform additional operations on each match.

**Library used**

There is no explicit library mentioned in the benchmark definition. However, it's likely that both `split()` and `match()` methods rely on JavaScript's built-in regex engine.

**Special JS features**

None are mentioned specifically in this benchmark. If you're interested in exploring other special features of JavaScript, I can provide information on topics like ES6 syntax, async/await, or modern language features.

**Other alternatives**

If you need to compare these methods under different conditions, here are some alternative approaches:

* **Using exec() instead of match()**: `exec()` returns a match object if the pattern is found, but it doesn't return null if no match is found. This can affect performance in cases where you only want to process matches.
* **Using a library like Lodash or regex101**: These libraries provide additional features and optimizations for working with regular expressions in JavaScript.

Keep in mind that the choice of method ultimately depends on your specific use case and performance requirements.

Related benchmarks:

split vs match with regex (version: 2)

Comparing performance of: split vs match

Created: 2 years ago by: Registered User

Jump to the latest result

split

match

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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