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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 &quot;-&quot;. &nbsp;For example: 
 
123-456 
1-00 
001 
9999999999 
9-99991-11 
 
Here is what I have so far but it does not work. &nbsp; 
 
&lt;asp:TextBox id=m_AccountNumber Runat=&quot;server&quot; CssClass=&quot;BodyContent&quot; Width=&quot;100&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/asp:TextBox&gt; 
 
&lt;asp:RegularExpressionValidator id=&quot;m_AcctNumValidator2&quot; Runat=&quot;server&quot; ControlToValidate=&quot;m_AccountNumber&quot; CssClass=&quot;ErrorMessage&quot; ErrorMessage=&quot;Not Valid-Numeric Only&quot; ValidationExpression=&quot;^[0-9]-&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/asp:RegularExpressionValidator&gt; 
 
&lt;asp:RequiredFieldValidator id=m_AcctNumValidator Runat=&quot;server&quot; CssClass=&quot;ErrorMessage&quot; ErrorMessage=&quot;Required.&quot; ControlToValidate=&quot;m_AccountNumber&quot;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;/asp:RequiredFieldValidator&gt;
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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>

RegularexpressionValidator Numeric Only, dash, size greater 3 bytes

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