.NET Extract IP address and port number from website source code.

Code
       source = New System.Net.WebClient().DownloadString("https://www.proxynova.com/proxy-server-list/country-cn/")



        ' Call Regex.Matches method.

        Dim ipMatches As MatchCollection = Regex.Matches(source, "\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b")



        ' Loop over matches.

        For Each m As Match In ipMatches

            ' Loop over captures.

            For Each c As Capture In m.Captures

                ' Display.

                'MessageBox.Show(c.Value)

                RichTextBox1.Text = RichTextBox1.Text + c.Value + vbCrLf

            Next

        Next



        Dim portMatches As MatchCollection = Regex.Matches(source, "^([0-9]{1,4}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])$")



        ' Loop over matches.

        For Each m As Match In portMatches

            ' Loop over captures.

            For Each c As Capture In m.Captures

                ' Display.

                'MessageBox.Show(c.Value)

                RichTextBox1.Text = RichTextBox1.Text + c.Value + vbCrLf

            Next

        Next