Benchmark: RegEx insensitive vs sensitive

Script Preparation code:

var string = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an Unknown printer took a galley of type and scrambled it to make a type specimen book.";
var sensetiveRegex = /unknown/i;
var insensetiveRegex = /unknown/;

Tests:

RegEx.test
sensetiveRegex.test(string);
RegEx.test insesetive
insensetiveRegex.test(string.toLowerCase())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegEx.test
RegEx.test insesetive

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what's being tested in this benchmark.

**Benchmark Definition**

The benchmark is comparing the performance of two approaches:

1. `sensetiveRegex.test(string);` (case-sensitive regex)
2. `insensetiveRegex.test(string.toLowerCase());` (case-insensitive regex with string conversion)

**Options Compared**

Two options are being compared:

* Case-sensitive regular expression (`sensetiveRegex`)
* Case-insensitive regular expression with string conversion to lowercase (`insensetiveRegex`)

**Pros and Cons**

* **Case-sensitive regex**: This approach is likely to be faster because the browser's regex engine can take advantage of the case-sensitivity optimization.
	+ Pros: Faster execution, less CPU cycles required
	+ Cons: May produce incorrect results for non-English strings
* **Case-insensitive regex with string conversion**: This approach may require more CPU cycles due to the string conversion, but it ensures accurate results across all languages.
	+ Pros: Accurate results for all languages, no need for string normalization
	+ Cons: Slower execution, more CPU cycles required

**Library and Purpose**

The `RegEx` object is part of the JavaScript `String.prototype` method, which provides a way to match patterns in strings using regular expressions. The `test()` method is used to perform a search on the entire string.

In this benchmark, the `RegEx` library is being used to compare the performance of case-sensitive and case-insensitive regex approaches.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in the benchmark definition or test cases. However, it's worth noting that the use of `i` at the end of the regex patterns (e.g., `/unknown/i`) indicates that the regex engine should perform a case-insensitive match.

**Other Alternatives**

If you wanted to run this benchmark on different platforms or browsers, you could modify the `DevicePlatform` and `Browser` fields in the latest benchmark result. Additionally, you could experiment with different string inputs or other regular expression patterns to see how they affect performance.

Keep in mind that the accuracy of the results may depend on the specific implementation details of the regex engine used by each browser, as well as any optimizations or caching mechanisms that might be in place.

Related benchmarks:

RegEx insensitive vs sensitive (version: 0)

Comparing performance of: RegEx.test vs RegEx.test insesetive

Created: 3 years ago by: Guest

Jump to the latest result

RegEx.test

RegEx.test insesetive

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):