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Detecting an Empty or Whitespace String using RegEx vs trim
(version: 0)
Comparing performance of:
RegEx vs Trim
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var testString = " ";
Tests:
RegEx
testString.match(/^ *$/) ? true : false
Trim
testString.trim().length === 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
Trim
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0
Browser/OS:
Firefox 123 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=512220" width="100%" height="500px"></iframe>
Trim
2391.8M/s
RegEx
30.1M/s
View exact numbers
Test name
Executions per second
✓
Trim
2,391,814,144 Ops/sec
RegEx
30,112,262 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the explanation into smaller parts to make it easier to understand. **Benchmark Definition** The benchmark measures the performance of two approaches to detecting an empty or whitespace string: using Regular Expressions (RegEx) and trimming the string. The test strings are set to contain only whitespace characters (`" "`). **Options Compared** Two options are being compared: 1. **RegEx**: This approach uses a regular expression to match any whitespace characters at the beginning of the string (`^ *`). If the pattern matches, it returns `true`, otherwise `false`. 2. **Trim**: This approach uses the built-in `trim()` method to remove leading and trailing whitespace characters from the string. **Pros and Cons** **RegEx:** Pros: * Can be used for more complex string matching tasks. * Can be flexible in its pattern (e.g., match any whitespace character, including newline). Cons: * Can be slower than trimming due to the overhead of parsing the regular expression. * May require more memory allocation, as the engine needs to create a regular expression object. **Trim:** Pros: * Generally faster and more efficient, as it uses an optimized algorithm for string trimming. * Requires less memory allocation, as it only creates a temporary string object. Cons: * Limited flexibility in terms of pattern matching. * May not work correctly with strings containing non-ASCII characters or special characters. **Library Used** The `match()` method is used to execute the RegEx pattern. The purpose of this method is to search for a match in the string and return the result. **Special JS Feature/Syntax** There are no special JavaScript features or syntax used in this benchmark that would require prior knowledge. However, understanding regular expressions can be helpful. **Other Alternatives** If you need to detect empty or whitespace strings, other alternatives could include: * Using a more specific RegEx pattern (e.g., `^\\s+$` for matching only whitespace characters at the start and end of the string). * Using other string manipulation methods, such as `replace()` or `slice()`, to remove leading/trailing whitespace. * Implementing your own trimming algorithm using bitwise operations. Keep in mind that these alternatives might have different performance characteristics and requirements for specific use cases.
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