Benchmark: regex vs multi-replace

Tests:

regex
const site = "archive.test.org"; const regex = new RegExp("https?:\/\/" + site + "\/"); for (let k = 0; k < 10000; k++) { "https://archive.test.org/board/".replace(regex, ""); }
multiple replaces
const site = "archive.test.org"; for (let k = 0; k < 10000; k++) { "https://archive.test.org/board/".replace("https://", "").replace("http://", "").replace(site).replace("/"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
multiple replaces

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

The benchmark compares two approaches to replace multiple substrings in a string: using a regular expression (regex) and using multiple separate `replace()` calls.

**Option 1: Regex**

In this approach, a regex pattern is created to match the target strings (`https://` and `/`) followed by the specific site URL. The pattern uses character classes and anchors to ensure only full matches are found. The regex is then used in a `for` loop to replace the matched substrings with an empty string.

**Pros:**

1.  Efficient for multiple replacements, as it allows the browser to optimize the replacement process internally.
2.  Can be more concise than manual string manipulation.

**Cons:**

1.  May require additional setup and configuration for optimal performance.
2.  Complexity can make it harder to understand and debug.

**Option 2: Multiple Replaces**

In this approach, multiple `replace()` calls are used sequentially to replace each target substring individually.

```javascript
const site = "archive.test.org";
let result = "https://archive.test.org/board/";

result = result.replace("http://", "");
result = result.replace(site, "");
result = result.replace("/", "");

console.log(result);
```

**Pros:**

1.  Easy to understand and maintain.
2.  Does not require any external libraries or setup.

**Cons:**

1.  May be less efficient than using a regex pattern, especially for larger strings or multiple replacements.
2.  Requires more code and can lead to more potential errors due to the sequential nature of the replacement process.

The benchmark provides results for both approaches on different browsers and devices, allowing users to compare performance across these factors.

As for other alternatives, some may consider using native JavaScript methods, such as `String.prototype.replace()` or `RegExp.prototype.test()`, but these would likely result in similar performance to the regex approach.

Related benchmarks:

regex vs multi-replace (version: 0)

Comparing performance of: regex vs multiple replaces

Created: 2 years ago by: Guest

Jump to the latest result

regex

multiple replaces

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):