正規表現を使用せずに URL からホスト名のルートを抽出するにはどうすればよいですか?

Extracting Hostname Root from a URL without Regular Expressions

In the quest to isolate the root of a URL from a text string, there exists a clever technique that bypasses the often criticized performance inefficiencies of regular expressions. This method leverages the hidden capabilities of a simple HTML anchor element.

Solution:

1. Create an HTML anchor element: .
2. Set the element's href attribute to the URL in question.
3. The hostname property of the anchor element will now contain the desired root domain, e.g., "www.example.com".

Example:

To demonstrate, consider the following function:

function url_domain(data) {
  var a = document.createElement('a');
  a.href = data;
  return a.hostname;
}

Using this function, we can extract the domain root from any given URL like so:

url_domain("http://www.example.com/12xy45") // "www.example.com"
url_domain("http://example.com/random") // "example.com"

This method offers a streamlined and efficient solution for extracting hostname roots, circumventing the perceived drawbacks associated with regular expressions in such scenarios.

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