Benchmark: RegexvsIndexOfvZ

HTML Preparation code:

<div></div>

Script Preparation code:

window.regex = /href|src|title|cid\:/;
window.data = 'title=https://gitlab.zivver.org/zivver/zivver-webapp/merge_requests/150';

Tests:

Regex
const regex = window.regex; const data = window.data; regex.test(data)
IndexOf
const data = window.data; data.indexOf('href') === -1 && data.indexOf('src') === -1 && data.indexOf('title') === -1 && data.indexOf('cid:') === -1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
IndexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition, test cases, and latest results to explain what's being tested.

**Benchmark Definition**

The benchmark is designed to compare two approaches for searching a string in JavaScript: regular expressions (Regex) versus the `indexOf()` method. The script preparation code defines two variables:

1. `window.regex`: A regular expression object containing three patterns (`href`, `src`, and `title`) that match specific substrings.
2. `window.data`: A string containing a URL with various query parameters, including some of the pattern strings from `window.regex`.

The HTML preparation code simply creates an empty `<div>` element.

**Options being compared**

There are two test cases:

1. **Regex**: This test case measures the performance of using the regular expression object (`window.regex`) to search for patterns in the `window.data` string.
2. **IndexOf**: This test case measures the performance of using the `indexOf()` method to search for specific strings within the `window.data` string.

**Pros and Cons**

* **Regex**: Pros:
	+ Can match complex patterns with anchors, quantifiers, and groups.
	+ Supports searching multiple substrings in a single call.
* Cons:
	+ Can be slower than `indexOf()` for simple searches due to the overhead of parsing the regular expression.
	+ May have issues with character encoding, Unicode support, or performance when dealing with very large strings.
* **IndexOf**: Pros:
	+ Generally faster and more straightforward for simple string matching.
	+ Less memory-intensive compared to regular expressions.
* Cons:
	+ Limited to searching for exact matches only.
	+ Can be slower for complex searches.

**Library: `window.data`**

The `window.data` variable is an example of a custom data class or object that represents the URL with query parameters. The library used here is not explicitly named, but it's likely a simple JSON-like data structure.

**Special JS feature/Syntax: None mentioned in this explanation**

No special JavaScript features or syntax are being tested in these benchmarks.

**Other alternatives**

If you wanted to add more alternatives to test, you could consider:

1. Using a different search algorithm, such as `String.prototype.includes()` or a custom implementation.
2. Adding support for Unicode characters and character encodings to the regular expression engine.
3. Testing with different data formats, like arrays or JSON objects instead of strings.
4. Measuring the performance of each method on smaller input sizes.

Keep in mind that these alternatives would require additional test cases to ensure comprehensive results.

In conclusion, this benchmark provides a useful comparison between regular expressions and `indexOf()` for string searching in JavaScript, helping developers understand the trade-offs between speed, complexity, and simplicity.

Related benchmarks:

RegexvsIndexOfvZ (version: 0)

Comparing performance of: Regex vs IndexOf

Created: 6 years ago by: Guest

Jump to the latest result

Regex

IndexOf

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):