Benchmark: regex vs indexOf

Tests:

regex
var result = 0; FILTERS = /\s*\|\s*([^\|\s:}]*)(?::((?:(?:[^\|\s,}]*),?)+))?\s*/g; var str = "{{value.foo.bar.baz[2]}}"; 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.foo.bar.baz[2]}}"; 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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I'll break down the benchmark and explain what's being tested, compared, pros and cons of different approaches, library usage, special JavaScript features, and alternatives.

**Benchmark Overview**

The benchmark compares two ways to search for a character in a string: using regular expressions (regex) and the `indexOf()` method. The test case uses a specific string with nested properties (`{{value.foo.bar.baz[2]}}`) to exercise both the regex and `indexOf()` methods.

**Regex vs. indexOf**

The two benchmark definitions are identical, except for the method used to check if the search character (`|`) is found in the string:

1. **Regex**: The `match()` method is called on the regular expression `FILTERS` with the input string `str`. If the regex finds a match, it sets the result variable `result` to 1; otherwise, it sets `result` to 0.
2. **indexOf**: The `indexOf()` method is called on the string `str` with the character `|` as an argument. If the character is found in the string, the function returns a non-negative index; if not, it returns -1.

**Pros and Cons**

* **Regex**:
	+ Pros: Can search for more complex patterns (including quantifiers, groups, and escape sequences).
	+ Cons: Can be slower than `indexOf()` for simple character searches.
* **indexOf()**:
	+ Pros: Fast and efficient for simple character searches; well-optimized by modern browsers.
	+ Cons: Only searches for exact matches; can't handle complex patterns or escaped characters.

**Library Usage**

There is no external library used in these benchmark definitions. The `match()` method is a built-in JavaScript function, while the `indexOf()` method is also part of the standard API.

**Special JavaScript Features**

There are no special JavaScript features explicitly mentioned in these benchmark definitions. However, it's worth noting that modern browsers often provide additional functionality or optimizations for certain methods (e.g., `let` and `const` declarations are used extensively in many web applications).

**Alternatives**

Other alternatives to regex and `indexOf()` could include:

* Using a different method for string searching, such as:
	+ The `includes()` method (introduced in ECMAScript 2015), which returns true if the string includes the specified value.
	+ A dedicated search library or function (e.g., `String.prototype.search()`).
* Implementing custom searching algorithms using bitwise operations or other techniques.

However, for most use cases, regex and `indexOf()` remain popular choices due to their simplicity and effectiveness.

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):