Benchmark: match vs exec2 - MeasureThat.net

Tests:

match
var re = /(?<=sb_)(?<ids>\S+?)(?=_bs)/mig; var match = "sb_12345_bs".match(re);
exec
var re = /(?<=sb_)(?<ids>\S+?)(?=_bs)/mig var match = re.exec("sb_12345_bs");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
match
exec

Fastest: N/A

Slowest: N/A

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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.

**What is being tested?**

The test compares two approaches to match strings against regular expressions: `match()` and `exec()` methods.

**Options compared**

1. **`match()`:** This method returns an array containing all matches of the pattern in the string, or null if no match was found. In this case, we're interested in whether it can find a match in a specific string.
2. **`exec()`:** This method executes the regular expression against a target string and returns an array with the matched values. If there is no match, it returns null.

**Pros and Cons**

* `match()`: Pros:
	+ Simpler to use, as it's more intuitive for finding all matches.
	+ Can be faster when dealing with large arrays of strings, since it doesn't have to execute the regex multiple times.
* `exec()`: Pros:
	+ More flexible, as it can return a single match or an array of matches.
	+ Can be useful when working with small amounts of data or specific use cases.

Cons for both:

* Both methods can be slower than other approaches (e.g., using the `RegExp` object's built-in matching functionality) since they iterate over the input string.
* `exec()` may be slower because it requires creating a new regex object each time, whereas `match()` reuses the same regex object.

**Library and purpose**

In neither test case is there an explicit library being used. However, if we look at the regex patterns, we can infer that they're using the "mig" flag (also known as "mixed" or "i" for "ignore case"), which allows for case-insensitive matching.

**Special JS feature**

There's no special JavaScript feature or syntax being tested here. The tests are purely focused on comparing the performance of `match()` and `exec()` methods.

**Other alternatives**

Alternatives to these two methods include:

* Using the `RegExp` object's built-in matching functionality, which can be faster for large inputs.
* Implementing custom regular expression engines or algorithms.
* Using external libraries like `regex-perf` (which measures regex performance) or other benchmarking tools.

Overall, this benchmark helps developers understand the trade-offs between using `match()` and `exec()` methods when working with regular expressions in JavaScript.

Related benchmarks:

match vs exec2 (version: 0)

Comparing performance of: match vs exec

Created: 6 years ago by: Guest

Jump to the latest result

match

exec

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):