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Hi Frineds,

<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>

This ValidationExpression="/^0?\d+$/" wont accept start form 0.

Like 786345 is correct and also 0786345 this also correct.

I want regular expression for accept numeric numbers and may be start from Zero

Please let me know.

This should work i hope

Try this regular expression "\d+$"

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