Benchmark: Global matching regex with and without + char

Script Preparation code:

var dummyString = 'Hello';
var iterations  = 2500;

Tests:

With +
for (var i = 0; i < iterations; i++) { dummyString.replace(/[^a-z0-9]+/gi, ''); }
Without +
for (var i = 0; i < iterations; i++) { dummyString.replace(/[^a-z0-9]/gi, ''); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
With +
Without +

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 is comparing the performance of two regular expression patterns:

1. `/[^a-z0-9]+/gi` (with `+` character)
2. `/[^a-z0-9]/gi` (without `+` character)

The pattern `/[^a-z0-9]+/gi` matches one or more characters that are not alphanumeric (`+` quantifier) globally (`i`) and ignoring case (`g`). The pattern `/[^a-z0-9]/gi` matches a single non-alphanumeric character globally (`i`) and ignoring case (`g`).

**Options Compared:**

The two options being compared are:

1. Matching one or more non-alphanumeric characters.
2. Matching a single non-alphanumeric character.

**Pros and Cons of Each Approach:**

1. **Matching one or more non-alphanumeric characters (/[^a-z0-9]+/gi)**:
	* Pros:
		+ More efficient when the pattern matches multiple times in the string (cache-friendly).
		+ Can be faster for larger strings.
	* Cons:
		+ May not match a single character, which can lead to slower performance if only one non-alphanumeric character needs to be matched.
2. **Matching a single non-alphanumeric character (/[^a-z0-9]/gi)**:
	* Pros:
		+ Guaranteed to match exactly one non-alphanumeric character.
		+ May be faster when only a single match is needed.
	* Cons:
		+ Less efficient than matching multiple characters due to the overhead of multiple regex engine calls.

**Other Considerations:**

1. **Library:** The `replace()` method is a built-in JavaScript function, which means no external library is required.
2. **Special JS feature:** There are no special JavaScript features or syntax mentioned in the benchmark definition.

**Alternative Benchmarking Approaches:**

If you want to explore alternative approaches, consider these:

1. **Using a regex testing tool like regex101.com**: This can help you visualize and compare the performance of different regex patterns without writing your own benchmark code.
2. **Creating a custom microbenchmark using a framework like Jest or Mocha**: These frameworks provide more advanced features for creating efficient benchmarks, such as parallel execution and caching.
3. **Using a JavaScript profiling tool like V8 Inspector or Node.js Inspector**: These tools can help you understand the performance characteristics of your code in a real-world context.

Keep in mind that the choice of benchmarking approach depends on your specific use case, performance requirements, and personal preferences.

Related benchmarks:

Global matching regex with and without + char (version: 0)

Comparison of performance of /[^a-z0-9]+/gi vs /[^a-z0-9]/gi in replace function, i.e. one vs many matches

Comparing performance of: With + vs Without +

Created: 9 years ago by: Guest

Jump to the latest result

With +

Without +

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):