Benchmark: Global matching regex with and without + char

Script Preparation code:

var dummyString = 'aA%↓6aA%↓6aA%↓6aA%↓6aA%↓6aA%↓6aA%↓6';
var iterations  = 1500;

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

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested on the provided JSON.

**Benchmark Definition**

The benchmark is designed to compare the performance of two regular expression (regex) patterns in a JavaScript `replace()` function:

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

**Options compared**

The benchmark is comparing the performance of these two regex patterns under the following conditions:

* The pattern matches one or more characters that are not letters or digits (`[^a-z0-9]`)
* The `i` flag at the end enables case-insensitive matching
* The `g` flag at the end enables global matching, which means the pattern will match all occurrences in the string, not just the first one

**Pros and Cons of each approach**

1. **With "+"**: Using the "+" character (also known as "greedy quantifier") can lead to better performance when you want to match one or more occurrences of a specific pattern. However, it can also lead to slower performance if the pattern is not well-optimized.
2. **Without "+"**: Without the "+" character, the regex engine will use a non-greedy approach (also known as "lazy quantifier") by default. This can lead to better performance in some cases, but may not be optimal for all scenarios.

**Library usage**

There is no library explicitly mentioned in this benchmark definition.

**Special JavaScript features or syntax**

The benchmark uses the following special JavaScript features:

* **Regex patterns**: The `replace()` function uses regular expression patterns to match and replace characters.
* **Variable declarations with var**: The `var` keyword is used to declare variables, such as `dummyString` and `iterations`.

**Other alternatives**

If you were to modify this benchmark or write a new one, you could consider the following alternatives:

* Use different regex patterns, such as `\w+` (match one or more word characters) or `\d+` (match one or more digits).
* Compare performance with different JavaScript engines or environments, such as Node.js vs. browser-based engines.
* Test the impact of using non-ASCII characters in the regex pattern.
* Use a more complex string or pattern to simulate real-world scenarios.

Keep in mind that this is just one possible way to approach benchmarking regex patterns. Depending on your specific use case and requirements, you may want to experiment with different approaches or test scenarios.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36

Browser/OS: Chrome 57 on Linux

View result in a separate tab

Test name	Executions per second
With +	327.1 Ops/sec
Without +	320.4 Ops/sec

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: 7 years ago by: Guest

Jump to the latest result

With +

Without +

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):