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Regex extract info vs Split
(version: 0)
Comparing performance of:
regexLessPerformant vs Coding with Javascript vs regexPerformant
Created:
3 years ago
by:
Guest
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Script Preparation code:
var stringList = ["Dev sprint 263" , "Dynatrace Sprint 263"]; var regexLessPerformant = /(?<version>\d{3})/; var regexPerformant = /(?<version>\d{3})$/;
Tests:
regexLessPerformant
for(var i = 0; i < stringList.length; i++){ stringList[i].match(regexLessPerformant).groups.version; };
Coding with Javascript
for(var i = 0; i < stringList.length; i++){ var splittedBy = stringList[i].split(" "); splittedBy[splittedBy.length -1] };
regexPerformant
for(var i = 0; i < stringList.length; i++){ stringList[i].match(regexPerformant).groups.version; };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
regexLessPerformant
Coding with Javascript
regexPerformant
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 benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares three approaches to extract information from a string: 1. **Regex extract**: Using regular expressions (`regexLessPerformant` and `regexPerformant`) to extract the version number from the input strings. 2. **Splitting**: Using the `split()` method to split the input strings into an array of words, and then accessing the last word (which is assumed to be the version number). **Options Compared** The three test cases compare the performance of: * `regexLessPerformant` (less performant regular expression) * A coding approach using JavaScript (no explicit regex usage) (`Coding with Javascript`) * `regexPerformant` (more efficient regular expression) **Pros and Cons** Here's a brief summary of the pros and cons of each approach: 1. **Regex extract**: * Pros: Can extract more information from the input strings (e.g., multiple versions). * Cons: Can be slower due to the complexity of the regular expressions. 2. **Splitting**: * Pros: Typically faster than regex extraction, as it's a simple string operation. * Cons: May not work correctly if the input strings contain spaces or other special characters that affect splitting. **Library Used** None explicitly mentioned in the provided code, but we can infer that JavaScript's built-in `match()` and `split()` methods are being used. **Special JS Feature/Syntax** The benchmark uses a feature called " capturing groups" (`(?<version>\\d{3})`) in regular expressions. This allows us to extract specific parts of the input strings (in this case, the version number) and store them in variables using the `groups` property. **Other Alternatives** If we were to modify the benchmark to include other approaches, here are some alternatives: * **Using a dedicated string processing library**: Instead of relying on JavaScript's built-in methods, we could use a library like Lodash or UglifyJS to perform string operations. * **Using a different regex pattern**: We could experiment with alternative regular expression patterns that might be faster or more efficient than the ones used in this benchmark. Keep in mind that these alternatives would require significant changes to the code and may not necessarily improve performance. The current benchmark provides a good starting point for exploring different approaches, but further optimizations or modifications might be necessary to achieve optimal results.
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