Dotnet4all Code Snippets: How to extract the host name from an URL (C#)

How to extract the host name from an URL (C#) (16 April 2007)

This snippet demonstrates how to extract the host/domain name from a valid URL using regular expressions.

  using System.Text.RegularExpressions;

  ...

  public static string ExtractDomainFromURL(string in_URL)
  {
    string regexPattern = @"^(?(?[^:/\?#]+):)?(?" 
                        + @"//(?[^/\?#]*))?(?[^\?#]*)"
                        + @"(?\?(?[^#]*))?" 
                        + @"(?#(?.*))?";

    Regex re = new Regex(regexPattern, RegexOptions.ExplicitCapture); 
    Match m = re.Match(in_URL);

    return m.Groups["s1"].Value + m.Groups["a1"].Value;
  }

Labels: Domain, Host, Regular Expression, URL

Posted by Xander Zelders

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