RegularExpression to validate Telegram Id in ASP.Net

Hi Hariom,

I will get back to you soon.

Hi Hariom,

Check the below Regular Expression.

HTML

Enter Telegram ID :
<asp:TextBox ID="txtTelegram" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="Enter Correct Telegram ID"
    ControlToValidate="txtTelegram" ForeColor="Red" SetFocusOnError="true" ValidationExpression="@([a-z]{4})*$"></asp:RegularExpressionValidator>