not allow space in regx expression.

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ASP.NET4

i am using regular expression validator to check Country code number. country code should be 2 to 3 digit. below expression is working but it will take space and empty text box. i dont want any space or empty textbox. i want changes in this expresssion to not allow space and i dont want to use required required field validator.

<asp:RegularExpressionValidator ValidationExpression="(Country Code)|^[0-9]{2,3}$" ID="revCountryCode"runat="server" ControlToValidate="txtCountryCode" ValidationGroup="Register" ErrorMessage=" Enter Valid Country Code" SetFocusOnError="true" ForeColor="Red"></asp:RegularExpressionValidator>

thanks
manohar