Benchmark: replace regex vs. multiple replaceAll calls - fixed

Tests:

replace regex
const pattern = String.raw`C:\foo\asdf\\blub\\bar//*(content-*|index-*)` const res = pattern.replace(/\\\\|\\|\/\//g, "/")
multiple replaceAll
const pattern = String.raw`C:\foo\asdf\\blub\\bar//*(content-*|index-*)` const res = pattern.replaceAll("\\", "/").replaceAll("//", "/")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
multiple replaceAll

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Windows

View result in a separate tab

Test name	Executions per second
replace regex	1523821.2 Ops/sec
multiple replaceAll	1103848.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that measures the performance of two different approaches for replacing special characters in a string using regular expressions or multiple `replaceAll` calls. The benchmark definition includes:

* A script preparation code, which sets up a constant variable `pattern` containing a raw string with backslashes (`\`) and other special characters. This pattern is used to test the replacement logic.
* An HTML preparation code, which is empty in this case.

**Individual Test Cases**

There are two test cases:

1. **"replace regex"**: This test case uses the `String.raw` syntax to define the `pattern` constant variable and calls the `replace()` method on it with a regular expression that matches multiple backslashes (`\\\\`) or forward slashes (`\\/`). The goal is to replace these special characters with forward slashes (`/`).
2. **"multiple replaceAll"**: This test case uses the same `pattern` constant variable but defines two separate `replaceAll()` calls to replace each of the special characters individually: backslashes (`\\`) and forward slashes (`//`).

**Options Compared**

The benchmark compares the performance of two approaches:

1. Using a single `replace()` method with a regular expression that matches multiple special characters.
2. Using multiple `replaceAll()` methods to replace each special character individually.

**Pros and Cons of Each Approach**

1. **"replace regex"**:
	* Pros:
		+ More concise code
		+ Might be more efficient due to the use of a single regular expression
	* Cons:
		+ Can be slower for large strings due to the overhead of compiling a complex regular expression
2. **"multiple replaceAll"**:
	* Pros:
		+ Might be faster for large strings since each `replaceAll()` call is optimized for a specific operation
	* Cons:
		+ Requires more code and is less concise

**Special JS Feature or Syntax**

The benchmark uses the `String.raw` syntax to define the raw string constant variable `pattern`. This syntax is used to preserve the backslashes in the string, which would otherwise be interpreted as escape characters.

**Library Used (if any)**

There are no external libraries mentioned in the benchmark definition or test cases. The regular expressions and replacement methods are part of the JavaScript standard library.

**Other Alternatives**

In addition to these two approaches, other alternatives could include:

* Using a different string interpolation method, such as template literals (`${pattern}`).
* Using a third-party library for string manipulation, such as `lodash` or `string-promise`.
* Using a different approach, such as using the `escapeRegExp()` function from the `punycode` library to escape special characters before replacing them.

However, these alternatives are not explored in this benchmark.

Related benchmarks:

replace regex vs. multiple replaceAll calls - fixed (version: 0)

Comparing performance of: replace regex vs multiple replaceAll

Created: 2 years ago by: Guest

Jump to the latest result

replace regex

multiple replaceAll

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):