Benchmark: Regex vs split/join 22345654321

Script Preparation code:

var str = 'Abcd:1234:1245:134';

Tests:

Regex
str.replace(/\:/g, "-");
Split and Join
str.split(':').join('-');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Split and Join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Regex	11446449.0 Ops/sec
Split and Join	15312145.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark you provided tests two different approaches for replacing characters in a string in JavaScript, specifically focusing on replacing colons (`:`) with hyphens (`-`). The two methods being compared are:

1. **Regex Method** (`str.replace(/\\:/g, "-")`)
2. **Split and Join Method** (`str.split(':').join('-')`)

### Options Compared

1. **Regex Method**
   - **Description**: This method uses a regular expression (regex) to find all occurrences of colons in the string and replace them with hyphens. The regex `/\\:/g` indicates a global search for colons (`:`). However, there's a slight oversight in the provided regex; it should be written as `/:/g` without the double backslash for accurate functionality in JavaScript.
   - **Pros**:
     - Conciseness: The method is very concise and directly reflects the intended operation (find and replace).
     - Flexibility: Regular expressions can provide more flexibility if the replacement pattern needs to be changed or extended (e.g., to match more complex patterns).
   - **Cons**:
     - Performance: Regex operations can be slower for larger strings or more complex patterns, as they involve additional overhead in pattern matching.
     - Complexity: For those not familiar with regex syntax, it may be less readable and harder to maintain compared to simpler string manipulation techniques.

2. **Split and Join Method**
   - **Description**: This approach splits the string into an array of substrings using the colon as a delimiter and then joins those segments back together using hyphens. Essentially, it transforms `'Abcd:1234:1245:134'` into an array with segments `['Abcd', '1234', '1245', '134']` and then rejoins them with `'-'`.
   - **Pros**:
     - Readability: The method is straightforward and easy to understand for those who might not be familiar with regex.
     - Performance: In many cases, this method can be faster than regex for simple replacements, as it avoids the overhead of pattern matching.
   - **Cons**:
     - Slightly more verbose: It requires two operations (splitting and joining), which may seem less elegant for straightforward replacements.

### Benchmark Results

From the latest benchmark results:

- The **Split and Join** approach had a performance of **15,312,145 executions per second**.
- The **Regex** approach performed at **11,446,449 executions per second**.

This indicates that, at least in this test environment with the given input, the Split and Join method outperformed the Regex method by a significant margin.

### Other Considerations

- **Alternatives**: There are alternative methods for achieving similar results, such as using `Array.prototype.reduce()` for replacements or even more complex string manipulation libraries such as Lodash, but for this particular task, the two methods compared are among the simplest and most commonly used.
- **Use Cases**: The choice between these two methods largely depends on specific use cases—if the operation is simple like replacing characters, Split and Join might be preferable for its speed and simplicity. However, if you plan to handle more complex patterns or requirements, Regex could be advantageous despite its complexity.

In conclusion, while both approaches can achieve the desired result, the Split and Join method seems to offer better performance in this benchmark scenario. Each method has its own strengths and weaknesses, and the decision on which to use should consider clarity, performance, and complexity relative to the specific task at hand.

Related benchmarks:

Regex vs split/join 22345654321 (version: 1)

Comparing performance of: Regex vs Split and Join

Created: one year ago by: Guest

Jump to the latest result

Regex

Split and Join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):