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Return regex group - match vs replace
(version: 0)
Comparing performance of:
replace vs match
Created:
4 years ago
by:
Guest
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Script Preparation code:
var value = "var(--foo)";
Tests:
replace
value.replace(/^\s*var\(\s*(--[\w-]+).*/, '$1');
match
value.match(/^\s*var\(\s*(--[\w-]+).*/)[1];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
replace
match
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. **Benchmark Definition** The benchmark definition is a script that prepares the test data. In this case, it simply assigns a value to a variable `value`, which contains a regex pattern: `"var(--foo)"`. There are two different approaches being compared: 1. **Replace**: The script uses the `replace()` method to remove the regex pattern from the string. 2. **Match**: The script uses the `match()` method to find the first occurrence of the regex pattern in the string. **Pros and Cons** 1. **Replace**: * Pros: This approach is likely faster because it's a simple string replacement operation, which can be optimized by the browser engine. * Cons: It may not handle cases where the regex pattern is nested or has complex logic. 2. **Match**: * Pros: This approach allows for more flexibility and accuracy in handling regex patterns with complex logic. * Cons: It's likely to be slower because it requires parsing the regex pattern, which can be computationally expensive. **Library and Purpose** The `--foo` syntax is likely a placeholder for a variable or expression that's not relevant to this benchmark. The actual library or purpose of this syntax is unknown without more context. **Special JS Features or Syntax** There are no special JavaScript features or syntaxes being used in this benchmark. It appears to be using standard JavaScript methods and variables. **Other Alternatives** If you wanted to rewrite this benchmark, here are some alternative approaches: 1. **Use a regex testing library**: Instead of relying on built-in `match()` and `replace()` methods, consider using a dedicated regex testing library like Jest or Mocha. 2. **Test with a different input**: The current benchmark uses a simple string with a single regex pattern. Consider using more complex inputs to test the robustness of the `match()` and `replace()` methods. 3. **Compare with other browsers**: While this benchmark only tests Chrome 100, consider adding support for other browsers like Firefox, Safari, or Edge to get a broader picture of how these methods perform. Overall, this benchmark is testing the performance differences between using `match()` and `replace()` methods for regex pattern matching and replacement.
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