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r1 v r2
(version: 0)
Comparing performance of:
r1 vs r2
Created:
9 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var str = '124961925861925691256981625'; var r1 = /\D/g; var r2 = /\D+/g;
Tests:
r1
str.replace(r1, '');
r2
str.replace(r2, '');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
r1
r2
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested on MeasureThat.net. **Benchmark Definition** The benchmark definition is a simple JavaScript code that defines two regular expressions: `r1` and `r2`. The purpose of these regular expressions is to match any non-digit characters (`\\D`) in a string. **Regular Expressions** * `r1 = /\\D/g;`: This regular expression matches any sequence of non-digit characters (`\\D`) globally (`g`) in the input string. * `r2 = /\\D+/g;`: This regular expression matches any sequence of one or more non-digit characters (`\\D+`) globally (`g`) in the input string. **Options compared** The benchmark is comparing the performance of two different approaches: 1. **`r1`**: Replaces all non-digit characters with an empty string, effectively removing them from the input string. 2. **`r2`**: Replaces one or more non-digit characters with an empty string, also removing them from the input string. **Pros and Cons** * Using `r1` (single character replacement): + Pros: Generally faster and more efficient, as it only removes single characters. + Cons: May not be suitable for cases where multiple consecutive non-digit characters need to be removed. * Using `r2` (multiple character replacement): + Pros: Suitable for cases where multiple consecutive non-digit characters need to be removed. + Cons: Generally slower and less efficient, as it removes one or more characters at a time. **Library** The benchmark doesn't explicitly use any libraries. However, the regular expressions themselves are built into JavaScript's ECMAScript specification, which is implemented by most modern browsers. **Special JS feature/Syntax** There are no special JavaScript features or syntaxes used in this benchmark. The code is written in standard JavaScript and should be compatible with most modern browsers. **Alternative approaches** Other alternatives to these two approaches could include: * Using a different regular expression pattern, such as `r = /\\D+|\\D/g;` which matches either one or more non-digit characters. * Using a different approach altogether, such as using a string replacement library like `String.prototype.replace()` with an array of replacements. **Benchmark Preparation Code** The benchmark preparation code defines two variables: `str` and the regular expressions `r1` and `r2`. The variable `str` contains a sample string containing non-digit characters. The regular expression patterns are defined as strings, which can be executed using JavaScript's built-in RegExp constructor. **Individual test cases** Each individual test case represents a separate benchmark that tests the performance of either `r1` or `r2`. The `Benchmark Definition` property specifies the code to be tested, and the `Test Name` property provides a label for each test case.
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