Solve the query related to regular expression
<p>I have 2 textbox; on one textbox I have two validations </p>

<p>1) required field validation for entering value and 
2) regular expression which take <code>Employee_id binary(7)</code>, its format is <code>- B-____</code> i.e B- will be fix 5 digits preceding it and what would be the format of this?</p>

<p>Another textbox has phone no. What would be the format of indian standard phone no.?</p>

<p>What will be the regular expression for these</p>

<pre><code>&lt;table&gt;
 &lt;td class="style35"&gt;
                &amp;nbsp;&lt;/td&gt;
            &lt;td class="style32"&gt;
                &lt;asp:Label ID="Lbl_Emp_Code" runat="server" Font-Bold="True" 
                    Text="Employee Code"&gt;&lt;/asp:Label&gt;
            &lt;/td&gt;
            &lt;td class="style34"&gt;
                &lt;asp:TextBox ID="Txt_Code" runat="server"&gt;&lt;/asp:TextBox&gt;
            &lt;/td&gt;
            &lt;td class="style31"&gt;
                &lt;asp:RequiredFieldValidator ID="Rfv_code" runat="server" 
                    ControlToValidate="Txt_Code" ErrorMessage="Please Enter Employee Code"&gt;*&lt;/asp:RequiredFieldValidator&gt;
                &lt;asp:RegularExpressionValidator ID="R_exp_v_Code" runat="server" 
                    ControlToValidate="Txt_Code" 
                    ErrorMessage="Please Enter correct Format of Employee Code"&gt;*&lt;/asp:RegularExpressionValidator&gt;
            &lt;/td&gt;
            &lt;td&gt;
                &amp;nbsp;&lt;/td&gt;
        &lt;/tr&gt;
        &lt;tr&gt;
            &lt;td class="style35"&gt;
                &amp;nbsp;&lt;/td&gt;
            &lt;td class="style32"&gt;
                &lt;asp:Label ID="Lbl_Emp_Name" runat="server" Font-Bold="True" 
                    Text="Employee Name"&gt;&lt;/asp:Label&gt;
            &lt;/td&gt;
            &lt;td class="style34"&gt;
                &lt;asp:TextBox ID="Txt_Name" runat="server"&gt;&lt;/asp:TextBox&gt;
            &lt;/td&gt;
            &lt;td class="style31"&gt;
                &lt;asp:RequiredFieldValidator ID="Rfv_name" runat="server" 
                    ControlToValidate="Txt_Name" ErrorMessage="Please Enter Employee Name"&gt;*&lt;/asp:RequiredFieldValidator&gt;
            &lt;/td&gt;
            &lt;td&gt;
                &amp;nbsp;&lt;/td&gt;

&lt;/table&gt;
</code></pre>
