<asp:TextBox ID="txtChequeNoCheck" runat="server" MaxLength="10" /> <asp:RegularExpressionValidator ID="RegularExpressionValidator7Check" runat="server" ControlToValidate="txtChequeNoCheck" Display="Dynamic" ErrorMessage="Invalid" ValidationExpression="/^0?\d+$/" ValidationGroup="paymentCheck" SetFocusOnError="true"></asp:RegularExpressionValidator>
"/^[0-9]*$/"
ValidationExpression="/^[0-9]+$/"
var
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