Benchmark: regex vs split + join

Script Preparation code:

var str = 'KA|1092|200092|16 Pin Universal Connecting Cable, 100cm|||16 Pin Universal Connecting Cable, 100cm||||Lagerartikel|Löschbar|Voll|2003-11-26 14:46:12 |2015-08-21 14:18:52 |2015-08-21 13:54:33 |Stk|Stk|||| ||0||               ||1.000000|0.000000|0.000000|1.000000|0.000000|1.000000|0.000000|1|Triemli|1|1|1|||||||||0.000000||||||30.07.2015||||0|0|0|0|0|0||0|0|0|0|0|0|||0|0|0|0|Spital|0|0|300.301|279.09|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|CHF|||304.04|Div. Zubehör|||||||4021a10|"K" Herzkatheteruntersuchungsmat. - Material|p_voll|p_voll|r_voll|r_voll||||||||||0|||';

Tests:

regex
str.replace(/"/g, '\\”');
split + join
str.split('"').join('\\"');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
split + join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:80.0) Gecko/20100101 Firefox/80.0

Browser/OS: Firefox 80 on Ubuntu

View result in a separate tab

Test name	Executions per second
regex	8271236.0 Ops/sec
split + join	17293982.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

The benchmark compares two approaches to replace special characters in a given string:

1. **Regex**: The first test case uses regular expressions (regex) with the `str.replace()` method. Specifically, it replaces backslashes (`\`) with their escaped equivalent (``).
2. **Split + Join**: The second test case splits the input string into an array using the `split()` method with a delimiter of double quotes (`"`) and then joins the resulting array back together using the `join()` method.

**Options being compared:**

* Regex vs Split + Join
* Replacement strategy for special characters

**Pros and Cons:**

1. **Regex**:
	* Pros:
		+ More flexible and powerful than string manipulation methods.
		+ Can be used to match complex patterns, including repetition, alternatives, and quantifiers.
	* Cons:
		+ Can be slower due to the overhead of parsing the regex pattern.
		+ May not be suitable for all types of data or text processing tasks.
2. **Split + Join**:
	* Pros:
		+ Faster than using regex, as it involves a simple array manipulation.
		+ More straightforward and easier to understand for some developers.
	* Cons:
		+ Less flexible and powerful than regex, especially when dealing with complex patterns.

**Library usage:**

In this benchmark, the `String.prototype.replace()` method is used, which is a built-in JavaScript method. There is no external library dependency.

**Special JS feature or syntax:**

The benchmark uses the following features:

* **Template literals**: Although not explicitly used in the provided code, template literals are mentioned in the script preparation code (e.g., `var str = 'KA|1092...`).
* **Escape sequences**: The use of `\`` is specific to JavaScript and represents an escape sequence.

**Other alternatives:**

If the benchmark were to compare other approaches, some possible alternatives could include:

1. **Using a different string manipulation method**, such as `str.replace()` with a callback function or using a library like `lodash`.
2. **Utilizing other regex features**, such as anchoring (`^` or `$`) or character classes (`[a-zA-Z]`).
3. **Employing a more efficient algorithm** for string replacement, such as using a trie data structure.

Keep in mind that the specific alternatives would depend on the requirements and goals of the benchmark, which are not explicitly stated here.

Related benchmarks:

regex vs split + join (version: 0)

Comparing performance of: regex vs split + join

Created: 4 years ago by: Guest

Jump to the latest result

regex

split + join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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