Check Valid or Invalid URL in VB.NET

A URL is the address of a specific Web site or file on the Internet. It cannot have spaces or certain other characters and uses forward slashes to denote different directories. Some examples of URLs are http://www.sourcecodester.com/, http://google.com/, etc. Now, let's start this validating a URL tutorial! 1. Let's start with creating a Windows Form Application for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application. 2. Next, add only one TextBox named Textbox1 for inputting a desired URL. Add also one button named Button1 to know if the inputted URL is valid or not. You must design your layout like this: design 4. Now put add this code for your code module. The Button1_click here will trigger to decide if the inputted URL in the textbox is valid or not.
  1. Imports System.Text.RegularExpressions
  2. Public Class Form1
  3. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  4. Dim pattern As String
  5. pattern = "http(s)?://([\w+?\.\w+])+([a-zA-Z0-9\~\!\@\#\$\%\^\&\*\(\)_\-\=\+\\\/\?\.\:\;\'\,]*)?"
  6. If Regex.IsMatch(TextBox1.Text, pattern) Then
  7. MsgBox("Valid URL!")
  8. Else
  9. MsgBox("Invalid URL!")
  10. End If
  11. End Sub
  12. End Class

Explanation:

We have imported System.Text.RegularExpressions because we will use a regular expression to match the pattern of the URL and the inputted URL in the textbox using IsMatch method. We have initialized pattern as String to hold a string value of http(s)?://([\w+?\.\w+])+([a-zA-Z0-9\~\!\@\#\$\%\^\&\*\(\)_\-\=\+\\\/\?\.\:\;\'\,]*)?. If the pattern will match the inputted URL in the textbox then it will display Valid URL!. Otherwise, it will prompt an Invalid URL!.

Output:

A valid URL: outputAn Invalid URL: output Download the source code below and try it! :) For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below and hire me. Best Regards,

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