Validating a Phone Number

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Simple example of validating a phone number:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
      ' Invalid phone number
'Dim strPhone As String = "123456789"

' valid phone number
    Dim strPhone As String = "(123) 456-7890"
    Dim regexp As New Regex(("^\(?\d{3}\)?\s|-\d{3}-\d{4}$"))

If regexp.IsMatch(strPhone) Then
           MsgBox("Valid Phone Number")
    Else
          MsgBox("Invalid Phone Number")
   End If

End Sub