Benchmark: RegEx.test new line 2

Script Preparation code:

var string = "Hello world! or something more long, blablabla";
var newLine = "\n"
var regex = /(\r?\n)/

Tests:

false
regex.test(string);
true
regex.test(newLine);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
false
true

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its options, pros and cons, and other considerations to help explain what's being tested.

**Benchmark Definition JSON**

The provided JSON defines a benchmark with two test cases:

1. `regex.test(string);`
2. `regex.test(newLine);`

Here, "string" is the variable prepared in the script preparation code, containing the string `"Hello world! or something more long, blablabla"`. The `\r` character in this string represents a carriage return, which is a special character that can affect newline handling.

The `newLine` variable contains a single newline character (`\n`) as defined in the script preparation code.

**Regex Library**

The benchmark uses a regular expression (regex) library to test for specific patterns. The regex `/(\\r?\\n)/` matches either:

* A carriage return (`\r`)
* A newline character (`\n`)

The `\r?` syntax is used to match either an optional `\r`. This allows the regex to handle both Windows-style line endings ( `\r\n` ) and Unix-style line endings ( `\n` ).

**Options Compared**

In this benchmark, two options are compared:

1. **Regex pattern with optional carriage return**: `/(\\r?\\n)/`
2. **Regex pattern without optional carriage return**: This option is not explicitly tested in the provided benchmark.

**Pros and Cons of Each Approach:**

1. **Regex pattern with optional carriage return (`\\r?\\n`)**:
	* Pros:
		+ Allows matching both Windows-style and Unix-style line endings.
		+ Reduces false positives (e.g., matching only `\n` instead of `\r\n`).
	* Cons:
		+ May be slower due to the optional character (`\r`) being evaluated.
2. **Regex pattern without optional carriage return**: This option is not explicitly tested, so no pros and cons can be mentioned.

**Other Considerations:**

1. **Handling different newline characters**: Depending on the use case, some systems might use other newline characters (e.g., `\v` for vertical tab).
2. **Character encoding**: The benchmark assumes a specific character encoding ( likely UTF-8), but using a different encoding might change the behavior of the regex pattern.
3. **Library-specific optimizations**: Some libraries may optimize their regex engine to handle certain patterns more efficiently.

**Other Alternatives:**

If you need to test for line endings in JavaScript, consider using the following alternatives:

1. `String.prototype.endsWith()` or `String.prototype.startsWith()`: These methods can be used with a regular expression to match specific suffixes or prefixes.
2. Using a library like `node-regex-tester` (for Node.js) or `jsregex` (for modern browsers), which provides more comprehensive testing features and might offer better performance.

Keep in mind that the benchmark provided is for measuring regex engine performance, and using alternative methods can provide different results depending on your specific use case.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Windows

View result in a separate tab

Test name	Executions per second
false	6779192.0 Ops/sec
true	7897307.0 Ops/sec

Related benchmarks:

RegEx.test new line 2 (version: 0)

Comparing performance of: false vs true

Created: one year ago by: Guest

Jump to the latest result

false

true

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):