How to: Extract a Protocol and Port Number from a URL 

The following code example uses Match.Result to extract a protocol and port number from a URL. For example, "https://www.contoso.com:8080/letters/readme.html" would return "http:8080".

Example

    Function Extension(url As String) As String
        Dim r As New Regex("^(?<proto>\w+)://[^/]+?(?<port>:\d+)?/", _
            RegexOptions.Compiled)
        Return r.Match(url).Result("${proto}${port}")
    End Function

    String Extension(String url) 
    {
        Regex r = new Regex(@"^(?<proto>\w+)://[^/]+?(?<port>:\d+)?/",
            RegexOptions.Compiled);
        return r.Match(url).Result("${proto}${port}"); 
    }

See Also

Other Resources

.NET Framework Regular Expressions