Multiple ValidationGroup for single user control and single error message

I have a form with a SAVE and SUBMIT button. Each button has its own validation group (validation rules are different between the two buttons). I have a textbox with several validators behind it. Two of them looks like this:
 
<asp:TextBox ID="txtTitle" runat="server"></asp:TextBox> <asp:RegularExpressionValidator ID="TitleMaxLengthValidatorOnSave" ControlToValidate="txtTitle" ValidationGroup="SubmitButton" ValidationExpression="(\s|.){0,100}$" ErrorMessage="Title cannot be more than 100 characters" runat="server" /> <asp:RegularExpressionValidator ID="TitleMaxLengthValidatorOnSubmit" ControlToValidate="txtTitle" ValidationGroup="SaveButton" ValidationExpression="(\s|.){0,100}$" ErrorMessage="Title cannot be more than 100 characters" runat="server" /&g ...