Validate email format - RegularExpressionValidator

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In asp.net in order to validate email address format we can use RegularExpressionValidator. We will see how to use RegularExpressionValidator to validate the email address format.For that we need to specify the Regular expression or regex in ValidationExpression property of the RegularExpressionValidator. Also we need to specify few other properties like ErrorMessage to display error message when email address is invalid. also we need to specify ControlToValidate property where we have to give textbox controls name in which user enters email address.

Validate email address using regular expression validator

Example to validate email address using RegularExpressionValidator

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>Validate email format </title>
</head>
<body>
  <form id="form1" runat="server">
  <div>
    <asp:TextBox ID="txtEmail" runat="server" />
    <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" />
    <asp:RegularExpressionValidator ID="validateEmail" runat="server" ErrorMessage="Invalid email."
      ControlToValidate="txtEmail" ValidationExpression="^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$" />
  </div>
  </form>
</body>


Also we need to check !Page.IsValid in event hadler of control like button or link...etc like
  protected void btnSubmit_Click(object sender, EventArgs e)
    {
      if (!Page.IsValid)
        return;
    }

Remove special characters - jQuery

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In this post we will see how to remove special characters like !,@,$,*,^ ...etc. from the string. For that we need to specify the special characters in regular expressions. Then by passing specified regular expression to .replace method in jquery and replace it with '' blank.

remove special characters from string in jquery

Example to remove special characters from string - jquery

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <title>Remove special character fromstring</title>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#Send").click(function () {
                var originalstring = $("#txtinput").val();
                var filteredString = originalstring.toLowerCase().replace( /[\*\^\'\!\@\$]/g , '');
                alert(filteredString);
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox runat="server" ID="txtinput"></asp:TextBox>
    <asp:Button runat="server" ID="Send" Text="Send" />
    </div>
    </form>
</body>
</html>


We can use regular expressions to define the special character set that we need to remove from string. so if you want to remove * from the string the regular expression will be /[\*]/g. Now if you want to remove ! also the add ! to regular expression like /[\*\!]/g and so on.

c# regex for email address

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In c# while dealing with email we need to validate email address. In order to validate email address we just check whether the email address format is correct or not. In C# we can use System.Text.RegularExpressions namesapce to match the email address for validation. In Regular Expressions namespace we have Regex class and from which .Match() method can be used to match the email address with the regular express defined using Regex class.

c# regex for email address

C# code to validate email format.

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>C# validate email format regex</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox runat="server" ID="txtemail"></asp:TextBox>
        <asp:Button runat="server" ID="Send" OnClick="Send_Click" Text="Send" />
    </div>
    </form>
</body>
</html>


using System;
using System.Text.RegularExpressions;
public partial class Csharpregularexpressionemail : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void Send_Click(object sender, EventArgs e)
        {
            ValidateEmail();
        }
        private void ValidateEmail()
        {
            string email = txtemail.Text;
            Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
            Match match = regex.Match(email);
            if (match.Success)
                Response.Write(email + " is corrct");
            else
                Response.Write(email + " is incorrct");
        }
    }


In above example we have specified format for email regex using constructure call of Regex class. Then we have used .Match method to match the regular express pattern for email to match. And after that we have checked if match is successfull or not.

.parent() - Get the parent of element jQuery

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Get the parent of element
In web applications while working with clientside we may need to get parent element of elected element. jQuery provides function .parent() that we can use to easily get parent of the element.

Here we will see example where we have link inside div and on clicking on link we will get it's parent div.

Code to get parent of element [jQuery]

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
     <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <title>Get parent of element</title>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#submitbtn").click(function () {
                var parent = $(this).parent();
                alert(parent.text());
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div style="border:1px blue solid; background-color:seashell; width:200px; height:100px;">
       This is parent
       <br/>
       <input type="button" id="submitbtn" value="Click Me"/>
    </div>
    </form>
</body>
</html>

Remove css style dynamically in jquery

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remove css style dynamically in jquery
Here we will see how to remove css style of the element in jquery. In web applications we need to remove css style dynamically to give user friendly ui effects and for that we can use .removeClass() function in jquery. Here we will see example of div in which when user clicks on link it will change color of div by applying css style dynamically.

Example to remove css style dynamically

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <title>Remove css style dynamically</title>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#clickme").click(function () {
                $("#dynamic-style").removeClass("myStyle");
            });
        });
    </script>
    <style type="text/css">
        .myStyle
        {
            width: 500px;
            height: 300px;
            background-color: wheat;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <a href="#" id="clickme">Change</a>
    <div id="dynamic-style" class="myStyle">
        Click change to change color.
    </div>
    </form>
</body>
</html>