Get domain name from URL

How to Get host domain from URL?

A URI (uniform resource identifier ) is a representation of a resource available to your application on the network. You can retrieve host of a url by using Request object or Uri.

Get domain name of a url

Using Request.Url

VB.Net

 
Dim host As String = Request.Url.Host.ToLower()

C#

 
string host = Request.Url.Host.ToLower();

Using Uri

 
Uri myUri = new Uri("http://forums.asp.net/t/1110512.aspx?");
string host = myUri.Host;

VB.Net

 
Dim myUri As New Uri("http://forums.asp.net/t/1110512.aspx?")
Dim host As String = myUri.Host

Or u can parse the url using regex

How to parse a domain from URL?

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string sURL = "http://forums.asp.net/t/1110512.aspx?";
            Regex rg = new Regex("://(?<host>([a-z\\d][-a-z\\d]*[a-z\\d]\\.)*[a-z][-a-z\\d]+[a-z])");
            if (rg.IsMatch(sURL))
            {
                MessageBox.Show (rg.Match(sURL).Result("${host}"));
            }
            else
            {
                MessageBox.Show(string.Empty);
            }
        }
    }
}

How to get domain part from URL

VB.Net

 
Imports System.Text.RegularExpressions
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sURL As String = "http://forums.asp.net/t/1110512.aspx?"
        Dim rg As New Regex("://(?<host>([a-z\d][-a-z\d]*[a-z\d]\.)*[a-z][-a-z\d]+[a-z])")
        If rg.IsMatch(sURL) Then
            MsgBox(rg.Match(sURL).Result("${host}"))
        Else
            MsgBox(String.Empty)
        End If
    End Sub
End Class

Extract domain name from URL

A better way you could go without the need for regular expression or parsing is to use the below code.

VB.Net

 
Request.ServerVariables["HTTP_HOST"]

C#

 
Request.ServerVariables("HTTP_POST")

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