Regular expression validator - DotNet and DataBase

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Saturday, 18 August 2018

Regular expression validator



Regular expression validator is to maintain the value of a particular field in a specific pattern. For example, user registration form is having the email field. The supplied email should in the correct format like "name@domain.com". Otherwise, we can treat the supplied email is incorrect. Using regular expression we can check whether the supplied email is in the correct format or not.

Example:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="RequiredFieldvalidator.aspx.cs" Inherits="WebProgramming.Validators.RequiredFieldvalidator" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table>
                <tr>
                    <td>
                      UserName:  <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="UserName is required." ControlToValidate="txtUserName"></asp:RequiredFieldValidator></td>
                </tr>
                 <tr>
                    <td>
                      Password:       <asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox><asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Password is required." ControlToValidate="txtPassword"></asp:RequiredFieldValidator></td>
                </tr>
                 <tr>
                    <td>
                      Confirm password:       <asp:TextBox ID="txtConfirmvalidator" runat="server"  TextMode="Password"></asp:TextBox><asp:RequiredFieldValidator ID="RangeValidator2" runat="server" ErrorMessage="Confirm password is required." ControlToValidate="txtConfirmvalidator" MinimumValue="18" MaximumValue="35"></asp:RequiredFieldValidator>
                        <asp:CompareValidator ID="cvConfirmpassword" runat="server" ControlToValidate="txtConfirmvalidator" ControlToCompare="txtPassword" ErrorMessage="Password mismatch"></asp:CompareValidator>
                    </td>
                </tr>
                 <tr>
                    <td>
                      Age:       <asp:TextBox ID="txtAge" runat="server"></asp:TextBox><asp:RangeValidator ID="rfvAge" runat="server" ErrorMessage="User age should be with in 18-35." ControlToValidate="txtAge" MinimumValue="18" MaximumValue="35"></asp:RangeValidator></td>
                </tr>

                  <tr>
                    <td>
                      Email:       <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox><asp:RegularExpressionValidator ID="RangeValidator1" runat="server" ErrorMessage="Supplied email is not in correct format." ControlToValidate="txtEmail" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator></td>
                </tr>

                <tr>
                    <td>
                        <asp:Button ID="btnSubmit" runat="server" Text="Submit"  /></td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>



Here ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" is the email format defined by the developer.

Output when wrong format supplied


















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