ASP.NET: RegularExpressionValidator for Alpha-numeric Textbox

<asp:RegularExpressionValidator
    id="RegularExpressionValidator1"
    runat="server"
    ControlToValidate="TextBox1"
    ValidationExpression="^[0-9a-zA-Z]+$"
    ErrorMessage="Only Alphanumeric characters">
</asp:RegularExpressionValidator>

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