Benchmark: regex vs indexOf

Tests:

regex
var result = 0; FILTERS = /\s*\|\s*([^\|\s:}]*)(?::((?:(?:[^\|\s,}]*),?)+))?\s*/g; var str = "{{value}}"; for (var i=0; i < 1000; i++) { typeof str.match(FILTERS) !== null ? result += 1 : result += 0; }
indexOf
var result = 0; FILTERS = /\s*\|\s*([^\|\s:}]*)(?::((?:(?:[^\|\s,}]*),?)+))?\s*/g; var str = "{{value}}"; for (var i=0; i < 1000; i++) { typeof str.indexOf('|') >= 0 ? result += 1 : result += 0; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
indexOf

Fastest: N/A

Slowest: N/A

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

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

**Benchmark Purpose**

The goal of this benchmark is to compare the performance of two approaches for searching a specific substring in a string: using regular expressions (`regex`) versus the built-in `indexOf` method.

**Options Being Compared**

There are two options being compared:

1. **Regular Expressions (Regex)**: This approach uses a regular expression pattern to search for a specific substring (`\\s*\\|\\s*([^\\|\\s:}]*)(?::((?:(?:[^\\|\\s,}]*),?)+))?`) in the input string (`{{value}}`). The `match` method is used to execute the regular expression pattern against the input string.
2. **Built-in indexOf Method**: This approach uses the built-in `indexOf` method to search for a specific substring (`'|'`) in the input string (`{{value}}`). If the substring is found, it returns the index of the first occurrence; otherwise, it returns -1.

**Pros and Cons of Each Approach**

**Regular Expressions (Regex)**

Pros:

* More flexible and powerful than `indexOf` for complex search patterns
* Can handle multiple occurrences of the searched substring

Cons:

* Generally slower than `indexOf` due to the overhead of compiling and executing a regular expression pattern
* May be less efficient for large input strings or simple searches

**Built-in indexOf Method**

Pros:

* Faster than `regex` for simple searches, as it's optimized for performance
* More lightweight and memory-efficient than `regex`

Cons:

* Less flexible than `regex`, as it only searches for an exact substring match
* May not work correctly if the searched substring is not a single character

**Library/Functionality Used**

In both test cases, the `match` method from JavaScript's String prototype is used to execute the regular expression pattern. This method returns an array containing information about the matched strings.

**Special JS Feature/Syntax**

The provided benchmark uses the `\\s*` and `[^\\|\\s:}]` special characters in the regular expression patterns, which are part of standard JavaScript syntax. These characters have special meanings in regular expressions:

* `\s*` matches zero or more whitespace characters
* `[^\\|\\s:}]` matches any character that is not a pipe (`|`), whitespace (`\s`), colon (`:`), or curly bracket (`{}`)

**Other Alternatives**

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

1. Using a different built-in method, such as `includes()` (available in ECMAScript 2019 and later) or `split()`
2. Implementing a custom substring search algorithm using iteration or array manipulation
3. Using a third-party library or framework for regular expression performance optimization

Keep in mind that the choice of approach depends on the specific requirements and constraints of the use case, as well as the characteristics of the input data.

Related benchmarks:

regex vs indexOf (version: 0)

Comparing performance of: regex vs indexOf

Created: 8 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):