Regular expression validator for 10 digit and numbers only c# asp.net
<p>i want a regular expression validator that will have numbers only till 10 digits</p>

<p>i have tried this but it is for only numbers and not for numbers of digit</p>

<pre><code>&lt;asp:RegularExpressionValidator ID="rvDigits" runat="server" ControlToValidate="txtMobId"
                                ErrorMessage="Enter numbers only till 10 digit" ValidationGroup="valGroup" ForeColor="Red"
                                ValidationExpression="\d+" /&gt;
</code></pre>