How to Extract Hostname from a URL Without Regular Expressions?

Extracting Hostname without Regular Expressions

Problem Statement

Matching the hostname of a URL without capturing the entire URL is a common task. Given a text string containing multiple URLs, the objective is to extract the hostname of only the two instances that resolve to a specific domain, such as example.com.

Alternative Solution

Instead of utilizing regular expressions, which can sometimes be inefficient, an alternative approach can be employed:

var tmp = document.createElement('a');
tmp.href = "http://www.example.com/12xy45";

This method leverages a hidden advantage. By creating a temporary anchor element and assigning it the URL string, we can access the hostname and host properties, which provide the hostname component without the URL path or protocol.

// tmp.hostname will now contain 'www.example.com'
// tmp.host will now contain hostname and port 'www.example.com:80'

To encapsulate this functionality into a convenient function:

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

By providing the URL string as an argument to this function, we obtain the hostname component as the result.

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