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Regex vs Split for base64 string
(version: 0)
Comparing performance of:
Regex vs Split
Created:
2 years ago
by:
Guest
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Script Preparation code:
var string = `eyJ0ZXN0IjoxLCJjb21wYW5pZXMiOlsxLDIsMyw0LDUsNl0sInVzZXIiOiJ0ZXN0IiwiZGF0ZSI6Illlc3RlcmRheSIsInN0YXJ0QXQiOiIyMDIzLTExLTAxVDAwOjAwOjAwLjAwMFoifQ==`;
Tests:
Regex
string.replace(/(=+)$/, '')
Split
string.split('=')[0]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Regex
Split
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 dive into the world of JavaScript microbenchmarks. **What is being tested?** The provided benchmark compares two approaches to manipulate a base64 string: using regular expressions (regex) and splitting the string using the `=` character as a delimiter. In this specific test case, the base64 string is: ``` eyJ0ZXN0IjoxLCJjb21wYW5pZXMiOlsxLDIsMyw0LDUsNl0sInVzZXIiOiJ0ZXN0IiwiZGF0ZSI6Illlc3RlcmRheSIsInN0YXJ0QXQiOiIyMDIzLTExLTAxVDAwOjAwOjAwLjAwMFoifQ== ``` The test case consists of two individual tests: 1. "Regex": This test uses the `replace()` method with a regex pattern to remove the last character (`=`) from the base64 string. 2. "Split": This test splits the base64 string using the `=` character as a delimiter and takes the first part. **Options compared** The two approaches are compared in terms of their performance, specifically: * Time taken to execute each approach * Number of executions per second **Pros and Cons of each approach:** 1. **Regex ("Regex")**: * Pros: + Can be more flexible for complex string manipulation + Does not require splitting the string into parts * Cons: + May be slower due to regex parsing and compilation overhead + Can be more memory-intensive if dealing with large strings 2. **Split ("Split")**: * Pros: + Typically faster due to simpler string manipulation + Less memory-intensive compared to regex * Cons: + May not be suitable for complex string manipulation or edge cases **Library/Dependency** None explicitly mentioned, but `String.prototype.replace()` and `String.prototype.split()` are built-in methods in JavaScript. **Special JS feature/syntax** None mentioned, but this benchmark focuses on basic string manipulation using native JavaScript methods. **Other alternatives** If you were to modify the test case or use a different approach, some alternatives could be: * Using other regex flavors (e.g., `RegExp`) * Implementing custom string splitting logic * Utilizing specialized libraries for string manipulation (e.g., `lodash.string`)
Related benchmarks:
Regex vs split 3
Testing regex vs split performance
Performance of replace() vs slice() vs split
string.split(RegExp); vs string.split(string);
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