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; }

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

For Loop

4.6M/s

RegEx

3.2M/s

Fastest: For Loop (1.4x faster)

View exact numbers

✓ For Loop: 4,625,820 ops/sec
• RegEx: 3,238,961 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

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

For Loop

524.6M/s

RegEx

493.3M/s

View exact numbers

Test name	Executions per second
✓ For Loop	524,563,872 Ops/sec
RegEx	493,255,808 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.

RegEx Length vs String Length (version: 5)

Comparing performance of: `RegEx vs For Loop`

Created: 4 years ago by: Registered User

Go to the latest result

RegEx

For Loop

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

RegEx Length vs String Length (version: 5)

Comparing performance of: RegEx vs For Loop

Created: 4 years ago by: Registered User

Go to the latest result

RegEx

For Loop

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `RegEx vs For Loop`