Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
match vs exec vs test
(version: 0)
r
Comparing performance of:
exec vs match vs test
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
exec
var re = /[$£]/ var match = re.exec("$");
match
var re = /[$£]/ var match = "$".match(re);
test
var re = /[$£]/ var match = re.test("$");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
exec
match
test
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **What is being tested?** MeasureThat.net is testing three different approaches to match regular expressions (regex) in JavaScript: 1. `exec()`: This method returns an array containing the matched strings, if there are any. 2. `match()`: This method returns an array of matches or null if no match was found. 3. `test()`: This method returns true if the string passed as an argument matches the pattern. **Options compared:** The test cases compare the performance of these three approaches on a specific regex pattern: `var re = /[$£]/\r\nvar match = ...` This regex pattern searches for `$` and `£` characters at the end of a string, but also considers `\r` (carriage return) as a possible match due to its ASCII value matching the ASCII value of `$`. **Pros and Cons:** 1. `exec()`: This method is generally faster because it returns an array with a single element, which requires less memory allocation and deallocation compared to arrays returned by `match()` and `test()`. 2. `match()`: This method can be slower because it needs to allocate more memory for the entire array of matches. 3. `test()`: This method is often considered faster than `exec()`, but slower than `match()`. It's also useful when only a single match is expected. **Library: None** There are no libraries used in this benchmark. **Special JS feature/syntax:** None mentioned explicitly, but note that the regex pattern uses `\r` (carriage return), which might be considered an unusual or edge case. However, it's still standard regex syntax and doesn't require any special JavaScript features. **Other alternatives:** To measure regex performance in JavaScript, other approaches could include: 1. Using a library like RegEx Benchmark, which provides a simple way to benchmark regex patterns. 2. Utilizing the `performance.now()` function to measure execution time without any extra libraries or dependencies. 3. Writing custom benchmarking code using a testing framework like Jest or Mocha. Keep in mind that these alternatives might require additional setup and configuration compared to MeasureThat.net's simple JSON-based interface.
Related benchmarks:
Which falsy expression (! vs === 0) is faster?
Which comparison operator (> vs === vs !truthy) is faster?
Which equals operator (== vs ===) is faster with string comparison?
Which equals operator (== vs ===) is faster with string comparison larger?
RegEx.exec vs StrRaasdhakshjding.match
Comments
Confirm delete:
Do you really want to delete benchmark?