Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Regex Exec vs String Split
(version: 0)
Comparing performance of:
String Split vs Regex Exec
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
string = "This is a benchmark to test if matching a regex is faster that splitting a string"; regex = /\S+/gi;
Tests:
String Split
string.split(" ")
Regex Exec
regex.exec(string)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
String Split
Regex Exec
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 is being tested, compared options, pros and cons, and other considerations. **Benchmark Overview** The benchmark is designed to compare the performance of two JavaScript operations: splitting a string using the `split()` method versus executing a regular expression (`regex.exec()`) on the same string. The goal is to determine which operation is faster. **Options Compared** There are two options being compared: 1. **String Split**: This option uses the `split()` method to divide the input string into an array of substrings, using whitespace as the separator. 2. **Regex Exec**: This option executes a regular expression (`/\\S+/gi`) on the input string, searching for one or more non-whitespace characters in a case-insensitive manner. **Pros and Cons** **String Split:** Pros: * Easy to implement and understand * Fast and efficient for small strings Cons: * May not be optimal for large strings due to memory allocation and array creation overhead * Can be slow if the input string is very large or contains many whitespace characters **Regex Exec:** Pros: * Can handle complex patterns and regular expressions efficiently * Fast and efficient for large strings, as it only processes a single character at a time Cons: * May be slower than `split()` for small strings due to the overhead of compiling and executing the regex pattern * Requires careful consideration of the regex pattern to optimize performance **Library and Special JS Features** In this benchmark, no specific JavaScript library is used. However, the use of regular expressions (`/\\S+/gi`) requires knowledge of regex syntax and patterns. **Test Case Considerations** The test case uses a simple input string ("This is a benchmark...") to test both options. The choice of input string is likely intended to be representative of typical use cases for this type of benchmark. **Other Alternatives** If `split()` or `regex.exec()` were not available, alternative approaches could include: * Using other string manipulation methods (e.g., `slice()`, `substring()`) * Implementing a custom regex engine or parser * Using native language features (e.g., C++ for performance-critical parts of the benchmark) **Benchmark Preparation Code** The provided `Script Preparation Code` sets up two variables: `string` and `regex`. The `string` variable is assigned a sample input string, while the `regex` variable is assigned a regex pattern (`/\\S+/gi`). This code can be executed at the start of each test case to ensure consistent inputs for both options. **Benchmark Result** The provided benchmark result shows the execution time per second (in executions) for each option on a specific browser and device platform. The results indicate that `regex.exec()` is faster than `split()` in this particular scenario.
Related benchmarks:
String.Split and String.Match
str.match vs str.split.pop
str.match vs str.Split(regex)
Regex vs Split Time
Comments
Confirm delete:
Do you really want to delete benchmark?