<script type="text/javascript">
function EmailValidation(sender, args) {
var email = $("#TextBoxEmailAddress").val();
var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
args.IsValid = re.test(email);
}
</script>
<asp:TextBox ID="TextBoxEmailAddress" runat="server" ClientIDMode="Static"></asp:TextBox>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Invalid email"
ClientValidationFunction="EmailValidation" ControlToValidate="TextBoxEmailAddress"></asp:CustomValidator>
