Benchmark: replaceAll str vs regex

Tests:

string
"test\u0000test\u0000test".replaceAll("\u0000", "!BAD!")
regex
"test\u0000test\u0000test".replaceAll(/\u0000/g, "!BAD!")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
string
regex

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
string	12895741.0 Ops/sec
regex	2933097.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore the benchmark you provided.

**What is being tested?**

The benchmark measures two approaches to replacing whitespace characters (`\u0000`) with a string `"!BAD!"` in a given input string. The two approaches are:

1. **JavaScript String Method**: This approach uses the `.replaceAll()` method, which replaces all occurrences of a specified value (in this case, `\u0000`) with another value (in this case, `"!BAD!"`).
2. **JavaScript Regex Method**: This approach uses regular expressions (`/\\u0000/g`) to replace all occurrences of whitespace characters (`\u0000`) with the string `"!BAD!"`.

**Options being compared**

The benchmark is comparing the performance of these two approaches:

* JavaScript String Method: `.replaceAll()`
* JavaScript Regex Method: `/\\u0000/g`

**Pros and Cons**

Here are some pros and cons for each approach:

* **JavaScript String Method (.replaceAll())**
	+ Pros:
		- Simple to understand and use
		- Fast, since it's a built-in method that doesn't require regex parsing
	+ Cons:
		- May not work as expected if the input string contains other whitespace characters (e.g., tabs, newline characters)
		- Can be slower than regex-based approaches for certain inputs
* **JavaScript Regex Method (/\\u0000/g)**
	+ Pros:
		- Flexible and can handle various types of whitespace characters
		- Can be faster than string-based approaches for large input strings
	+ Cons:
		- Requires regex knowledge, which can add complexity to the code
		- May be slower than string-based approaches for very small input strings

**Library/Regex**

In this benchmark, a regular expression is used (`\\u0000`) to match whitespace characters. The `/g` flag at the end of the regex pattern indicates that all occurrences should be replaced, not just the first one.

**Special JS feature/Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark. It's purely focused on comparing two basic string replacement approaches.

**Other alternatives**

If you want to test other approaches, here are some alternative methods:

* **Using a library**: Consider using libraries like `string-escape` or `regex-optimize` to optimize regex patterns for performance.
* **Native browser functions**: Use native browser functions like `String.prototype.replace()` or `String.prototype.normalize()` to replace whitespace characters.
* **Other programming languages**: If you want to test this benchmark with other programming languages, consider using frameworks that provide similar string replacement functionality.

Keep in mind that the best approach will depend on your specific use case and requirements.

Related benchmarks:

replaceAll str vs regex (version: 0)

Comparing performance of: string vs regex

Created: 2 years ago by: Guest

Jump to the latest result

string

regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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