RegularExpressionValidator is very useful control to validate any custom logic. For example in this sample code, 5 digit zip code validation is implemented using asp.net.
So whenever user enters the input other than 5 digits. It prompts for error.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html>
<body>
<form id="Form1" runat="server">
<h4>
Check for 5 digit zip code</h4>
<br />
Enter a zip code of 5 digits:
<asp:TextBox ID="txtRegularExp" runat="server"></asp:TextBox>
<br />
<br />
<asp:Button ID="Button1" Text="Validate" runat="server" />
<br />
<br />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" ControlToValidate="txtRegularExp"
ValidationExpression="\d{5}" ErrorMessage="Please enter 5 digit zip code" runat="server" />
</form>
</body>
</html>
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