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Hojoformo

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RegularexpressionValidator Numeric Only, dash, size greater 3 bytes

How can I create a ASP.NET regularexpressionvalidator control for a required field that needs to be numeric, size greater than 3 btyes and can have a dash "-".  For example:

123-456
1-00
001
9999999999
9-99991-11

Here is what I have so far but it does not work.  

<asp:TextBox id=m_AccountNumber Runat="server" CssClass="BodyContent" Width="100">                                                                            </asp:TextBox>

<asp:RegularExpressionValidator id="m_AcctNumValidator2" Runat="server" ControlToValidate="m_AccountNumber" CssClass="ErrorMessage" ErrorMessage="Not Valid-Numeric Only" ValidationExpression="^[0-9]-">                                                                    </asp:RegularExpressionValidator>

<asp:RequiredFieldValidator id=m_AcctNumValidator Runat="server" CssClass="ErrorMessage" ErrorMessage="Required." ControlToValidate="m_AccountNumber">           </asp:RequiredFieldValidator>
ASKER CERTIFIED SOLUTION
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clockwatcher

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