asp.net RegularExpressionValidator example: how to validate U.S. Zip Code

This example explains how to validate US ZIP Code using RegularExpressions in C#, UK Postal Code,Canada Postal Code, and Indian Postal Code.  asp.net RegularExpressionValidator example: how to validate U.S. Zip Code  asp.net RegularExpressionValidator example: how to validate Indian Postal Code asp.net RegularExpressionValidator example: how to validate Canada Postal Code asp.net RegularExpressionValidator example: how to validate UK postal Code  This example explains how to implement postal codes Validations for various countries in a single webpage using Validation Groups and regular expressions <div>                   <asp:BulletedList ID="BulletedList1" runat="server" BackColor="#666699" BulletStyle="UpperRoman" ForeColor="White">             <asp:ListItem>US ZIP CODE Validation using Regular Expressions C#</asp:ListItem>             <asp:ListItem>INDIAN POST CODE Validation using Regular Expressions C#</asp:ListItem>             <asp:ListItem>CANADA POST CODE Validation using Regular Expressions C#</asp:ListItem>             <asp:ListItem>UK POST CODE Validation using Regular Expressions C#</asp:ListItem>         </asp:BulletedList>         <asp:Label ID="Label1" runat="server" Text="Enter US ZipCode"></asp:Label>         <asp:TextBox ID="txtUSZipCode" runat="server" Height="18px" Width="263px" ValidationGroup="usa"></asp:TextBox>         <asp:Button ID="btnValidate" runat="server" Text="Validate ZIP Code" OnClick="btnValidate_Click" />         <asp:RegularExpressionValidator ID="RegularExpressionValidator1" ValidationGroup="usa" runat="server" ControlToValidate="txtUSZipCode"              ErrorMessage="zip code format:xxxxx(-xxxx)" ValidationExpression="\d{5}(-\d{4})?" Display="Dynamic" BackColor="#FF0066"></asp:RegularExpressionValidator>         <br />         <asp:Label ID="Label2" runat="server" Text="Enter India Postal Code"></asp:Label>         <asp:TextBox ID="txtIndianPostCode" runat="server" Height="18px" Width="263px" ValidationGroup="india"></asp:TextBox>         <asp:Button ID="Button1" runat="server" Text="Validate Indian postal Code" OnClick="btnValidate_Click" />         <asp:RegularExpressionValidator ID="RegularExpressionValidator2" ValidationGroup="india" runat="server" ControlToValidate="txtIndianPostCode"              ErrorMessage="Indian Post Code format:xxxxxx" ValidationExpression="\d{6}" Display="Dynamic" BackColor="Red"></asp:RegularExpressionValidator>         <br />          <asp:Label ID="Label3" runat="server" Text="Enter Canada Postal Code"></asp:Label>         <asp:TextBox ID="txtcanadapostalcode" runat="server" Height="18px" Width="263px" ValidationGroup="canada"></asp:TextBox>         <asp:Button ID="Button2" runat="server" Text="Validate canada PostalCode" OnClick="btnValidate_Click" />         <asp:RegularExpressionValidator ID="RegularExpressionValidator3" ValidationGroup="canada" runat="server" ControlToValidate="txtcanadapostalcode"              ErrorMessage="Canada Post Code format:A1A 0A0" ValidationExpression="[a-zA-Z]\d[a-zA-Z]\s\d[a-zA-Z]\d"Display="Dynamic" BackColor="Red"></asp:RegularExpressionValidator>         <br />          <asp:Label ID="Label5" runat="server" Text="Enter UK Postal Code"></asp:Label>         <asp:TextBox ID="txtUKPostalCode" runat="server" Height="18px" Width="263px" ValidationGroup="UK"></asp:TextBox>         <asp:Button ID="Button3" runat="server" Text="Validate UK PostalCode" OnClick="btnValidate_Click" />         <asp:RegularExpressionValidator ID="RegularExpressionValidator4" ValidationGroup="UK" runat="server" ControlToValidate="txtUKPostalCode"              ErrorMessage="UK WC  Post Code format:AA9A 9AA" ValidationExpression="[a-zA-Z]{2}\d[a-zA-Z]\s\d[a-zA-Z]{2}" Display="Dynamic" BackColor="#CC0000"></asp:RegularExpressionValidator>         <br />         <asp:Label ID="Label4" runat="server" Text="Label"></asp:Label>     </div>         protected void Page_Load(object sender, EventArgs e)         {             ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition             {                 Path = "~/scripts/jquery-1.4.1.min.js",                 DebugPath = "~/scripts/jquery-1.4.1.js",                 CdnPath = "http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.1.min.js",                 CdnDebugPath = "http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.1.js"             });             Page.Validate("usa");  //validatation group usa controls validation             Page.Validate("canada"); //validatation group canada controls validation              Page.Validate("india"); //validatation group india controls validation             Page.Validate("UK");//validatation group UK controls validation             if (Page.IsValid)             {                 Label4.Text = "Page is Valid";             }             else Label4.Text = "Page is not Valid!";         }   output