Benchmark: Regex vs Split - MeasureThat.net

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
var testStringSplit = "    &.fieldName";
var splitReg = /&./;
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

String Split
/*When writing async/deferred tests, use `deferred.resolve()` to mark test as done*/ var [stringOne, stringTwo] = testStringSplit.split("&."); /*When writing async/deferred tests, use `deferred.resolve()` to mark test as done*/
Regex split
var [stringOne, stringTwo] = testStringSplit.split(splitReg);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String Split
Regex split

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Linux

View result in a separate tab

Test name	Executions per second
String Split	40770884.0 Ops/sec
Regex split	15621222.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 6 months ago):

LLMs can make mistakes. Check important info.

The benchmark named "Regex vs Split" compares two different methods for splitting a string in JavaScript: using a simple string method (`String.prototype.split`) and using a regular expression (`RegExp` with `.split()`).

### Options Compared

1. **String Split**:
   - **Test Name**: "String Split"
   - **Benchmark Definition**: 
     ```javascript
     var [stringOne, stringTwo] = testStringSplit.split("&.");
     ```
   - This option uses the built-in `split` method, which splits the string on the specified delimiter, in this case, a simple literal "&."

2. **Regex Split**:
   - **Test Name**: "Regex split"
   - **Benchmark Definition**: 
     ```javascript
     var [stringOne, stringTwo] = testStringSplit.split(splitReg);
     ```
   - This option employs a regular expression to split the string, where `splitReg` is defined as `/&./`. This regex matches the character "&" followed by any character.

### Pros and Cons

**String Split (Literal)**
- **Pros**:
  - **Performance**: Generally faster than regex because it doesn't involve the overhead of compiling and executing a regular expression.
  - **Simplicity**: Easier to read and understand for those familiar with basic string manipulation.

- **Cons**:
  - **Limitations**: Can only split based on exact string literal matches. It lacks the flexibility of conditions that regex provides.

**Regex Split**
- **Pros**:
  - **Flexibility**: Provides more complex pattern matching and can handle various splitting rules (e.g., multiple delimiters, conditions).
  - **Power**: Regexes can match patterns beyond static strings, enabling more sophisticated text parsing.

- **Cons**:
  - **Performance**: Typically slower than simple string splitting due to regex processing overhead.
  - **Complexity**: Regular expressions can be difficult to read and understand, especially for those who aren't experienced with them. Debugging regex can also be challenging.

### Considerations
When deciding between these two approaches, consider the following:
- **Readability vs Performance**: If performance is critical and the string to be split is relatively straightforward, using simple `split()` might be the best choice. However, if you're dealing with complex patterns, regex might be more appropriate despite potential performance hits.
- **Maintainability**: Codebase maintainability can be impacted by the use of regex, as complex patterns require more documentation and understanding.

### Alternatives
Aside from `split()` and regex, other alternatives for splitting strings might include:
- **String Manipulation**: Using combination of other string methods like `indexOf`, `slice`, or `substring`.
- **Third-Party Libraries**: Libraries such as Lodash can provide enhanced string manipulation utilities which might simplify handling more complex splitting tasks.
- **Using for loops**: In some cases, implementing a custom splitting function using loops could be optimized for specific scenarios.

In conclusion, the choice between `split()` and `regex.split()` largely hinges on performance needs versus the complexity of the string manipulation required, depending on the specific use case in the software being developed.

Related benchmarks:

Regex vs Split (version: 1)

Comparing performance of: String Split vs Regex split

Created: 6 months ago by: Guest

Jump to the latest result

String Split

Regex split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 6 months ago):