Benchmark: Pre-compiled regex vs fresh

Script Preparation code:

var reLiteral = /^[0-9a-fA-F]{24}$/

Tests:

Pre-compiled
reLiteral.test('132abc67219f019afe12901a')
Fresh
/^[0-9a-fA-F]{24}$/.test('132abc67219f019afe12901a')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Pre-compiled
Fresh

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition:**

The benchmark is comparing two approaches:

1. **Pre-compiled regex**: This approach uses a literal string `reLiteral` that represents a compiled regular expression (`^([0-9a-fA-F]{24})$`). The idea behind pre-compiling the regex is to reduce the overhead of compiling a new regex object each time it's used.
2. **Fresh regex**: This approach uses a fresh, uncompiled regular expression literal `/^[0-9a-fA-F]{24}$/`. The goal here is to test the performance of using a freshly created regex object.

**Pros and Cons:**

* **Pre-compiled regex:**
	+ Pros:
		- Reduced compilation overhead, as the regex is already compiled when defined.
		- Can lead to better performance in terms of execution speed.
	+ Cons:
		- The regex pattern itself needs to be defined at compile-time, which might not always be desirable.
		- If the regex pattern changes, it would require re-compiling the `reLiteral` variable.
* **Fresh regex:**
	+ Pros:
		- Flexibility in defining the regex pattern, as it can be changed without modifying the underlying code.
		- Easier to maintain and update the regex patterns over time.
	+ Cons:
		- Higher compilation overhead, as a new regex object needs to be created each time it's used.

**Library:**

None of the test cases use any external libraries. The regular expression literals are defined directly in the JavaScript code.

**Special JS Features/Syntax:**

There is no special JavaScript feature or syntax being tested here. The focus is on comparing the performance of two different regex approach, which is a fundamental aspect of JavaScript programming.

**Other Alternatives:**

If you want to test similar scenarios, you could explore other approaches:

1. Using `new RegExp()` instead of literal strings.
2. Compiling regex patterns using `RegExp.prototype.compile()`.
3. Comparing the performance of different regex engines (e.g., `v8` vs `es6-regex`).
4. Testing the impact of different optimization techniques, such as caching or memoization.

Keep in mind that these alternatives might introduce additional complexity and require modifications to the benchmark definition and test cases.

Related benchmarks:

Pre-compiled regex vs fresh (version: 0)

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Comparing performance of: Pre-compiled vs Fresh

Created: 7 years ago by: Guest

Jump to the latest result

Pre-compiled

Fresh

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):