Benchmark: RegEx Length vs String Length

Script Preparation code:

var string = '1b3d5f7';
var valid = false;

Tests:

RegEx
valid = /.{8,}/.test(string);
For Loop
valid = true; if (string.length < 8) { valid = false; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegEx
For Loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
RegEx	493255808.0 Ops/sec
For Loop	524563872.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition, test cases, and results for you.

**Benchmark Definition:**
The provided JSON represents a JavaScript microbenchmark that tests two different approaches to determine if a string length is within a certain range. The benchmark consists of two test cases:

1. **RegEx**: This test case uses a regular expression (RegEx) to check if the string length is between 8 and infinity (`{8,}`).
2. **For Loop**: This test case uses a traditional for loop to iterate through the characters in the string and check if its length is less than 8.

**Options Compared:**
The two options being compared are:

* Using regular expressions (RegEx) to check string lengths
* Using a traditional for loop to check string lengths

**Pros and Cons of Each Approach:**

1. **RegEx**:
	* Pros:
		+ More concise and readable code
		+ Can be more efficient than manual looping for certain operations
	* Cons:
		+ May not be as understandable by non-technical users due to the use of special characters and syntax
		+ Can be slower or less predictable than manual looping in some cases, especially when dealing with very large inputs
2. **For Loop**:
	* Pros:
		+ Generally more readable and understandable than RegEx for non-technical users
		+ Can provide better performance and predictability, especially for large inputs
	* Cons:
		+ More verbose code compared to RegEx
		+ May not be as concise or expressive

**Library:**
There is no specific library mentioned in the provided JSON. However, it's worth noting that RegEx uses a part of the JavaScript standard library (ECMAScript).

**Special JS Feature/Syntax:**
This benchmark does not use any special JavaScript features or syntax beyond what's commonly used in regular expressions.

**Other Alternatives:**
If you need to compare string lengths, other alternatives to RegEx and for loops could include:

* Using built-in array methods like `array.prototype.length` or `String.prototype.length`
* Utilizing native JavaScript functions like `Object.keys()` or `Array.prototype.reduce()`
* Employing bitwise operations, such as checking the high bits of the number representing the string length

In summary, this benchmark allows users to compare the performance of two different approaches to determining if a string length is within a certain range: using regular expressions and traditional for loops.

Related benchmarks:

RegEx Length vs String Length (version: 5)

Comparing performance of: RegEx vs For Loop

Created: 4 years ago by: Registered User

Jump to the latest result

RegEx

For Loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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