How do I validate multiple controls with the same Validator?

I have a validator like the one below. Right now it's only validating one control, but there are many controls on the page with the same validation criteria. How do I assign it to multiple controls? Do I really need to duplicate the validator?

                <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
                    ErrorMessage="Only alphanumeric  values are allowed for page names."
                    Display="None"
                    ControlToValidate="TextBoxCreatePage"
                    ValidationExpression="^[a-zA-Z][a-zA-Z0-9_]+$"
                    SetFocusOnError="True" />
bemara57Asked:
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zkeownCommented:
I don't know of anyway to do so unless you create it in the code behind and assign it to the controls on Page_Load
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