Thursday, 26 July 2012

What is RegularExpressionValidator Control in ASP.NET | What is the use of RegularExpressionValidator Control in ASP.NET | How to use RegularExpressionValidator Control in ASP.NET

                                     Hi friends, in this article I will explain about RegularExpressionValidator for Email ID in ASP.NET or  ASP.NET RegularExpressionValidator example.
The RegularExpressionValidator control is used to check that an input value matches a specified pattern or not.
I will explain this with small example.
Take one new web site(file--- new website--- give name o the website).
Take one webpage name it as resularexp.aspx and drag and drop the RegularExpressionValidator as shown in the below figure.



And write the following code in the .aspx source file.
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="regularexp.aspx.vb" Inherits="regularexp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>RegularExpressionValidator for Email ID</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1 style="color:Green ">RegularExpressionValidator for Email ID</h1>
    Enter Email Adress:<asp:TextBox ID="Email" runat="server" Width="240px"></asp:TextBox>
    <asp:RegularExpressionValidator
                ID="RegularExpressionValidator1"
                runat="server"
                ErrorMessage="Email missed @ or ','.Pls Check once and Enter Valid Email ID"
                ValidationGroup="rgSubmit"
                ControlToValidate="Email"
                CssClass="requiredFieldValidateStyle"
                ForeColor="Red"
                ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">
    </asp:RegularExpressionValidator>
    </div>
    </form>
</body>
</html>

In the above web page.I put the code for cheching the email address.It checks only @ and ‘,’ is there or not.If  either @ or ‘,’ miss it will raise the error Email missed @ or ','.Pls Check once and Enter Valid Email ID .Run the code. It will like below .if you don’t enter valid email address it will shown like below figure.


in previous articles i explained about validation controls in ASP.NET and how to use the validation controls in ASP.NET.
CompareValidator in ASP.NET
CustomValidator Control, How to Validate with a Custom Function for ASP.NET Server Controls, ASP.NET CustomValidator Control.
RegularExpressionValidator for Email ID in ASP.NET or ASP.NET RegularExpressionValidator example.
ValidationSummary in ASP.NET
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