Email validation Using ASP.NET

---

Dim strRegexEmail As String = "^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" & _
"\.[0-9]{1,3}\.[0-9]{1,3}\.)(([a-zA-Z0-9\-]+\" & _
".)+))([a-zA-Z]{2,4}[0-9]{1,3})(\]?)$"

Dim re As New Regex(strRegexEmail)

If Not re.IsMatch(txtEmail.Text) And Trim(txtEmail.Text) <> "" Then
            ClientErrorMSG = "Email Address is Invalid"
            txtEmail.Focus()
End If