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Introduction

Here I will explain regular expression for email validation in c#, asp.net or how to validate email with regular expression in c#, asp.net or email address validation with regular expression in c#, asp.net

Description:


Regular Expression to Validate Email Address

To validate email address we need to write the regular expression like this


bool isEmail = Regex.IsMatch(txtEmail.Text.Trim(), @"\A(?:[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?\.)+[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)\Z");
If you want to see it in complete example write the following code in your aspx page like as shown below


<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Regular Expression to validate Email Address</title>
</head>
<body>
<form id="form1" runat="server">
<table>
<tr>
<td><b>Enter Email:</b></td>
<td>
<asp:TextBox ID="txtEmail" runat="server" />
</td>
</tr>
<tr>
<td></td>
<td><asp:Button ID="btnValidate" runat="server" Text="Validate Email"
onclick="btnValidate_Click" /> </td>
</tr>
</table>
<asp:label id="lblerrormsg" runat="server" style=" font-weight:bold" />
</form>
</body>
</html>
Once we write the code in aspx page add following namespaces in your code behind file


using System;
using System.Text.RegularExpressions;
Now write the following code in your code behind file


protected void btnValidate_Click(object sender, EventArgs e)
{
bool isEmail = Regex.IsMatch(txtEmail.Text.Trim(), @"\A(?:[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?\.)+[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)\Z");
if (!isEmail)
{
lblerrormsg.Text = "Enter Valid Email ID..";
lblerrormsg.ForeColor = System.Drawing.Color.Red;
return;
}
else
{
lblerrormsg.Text = "Valid Email";
lblerrormsg.ForeColor = System.Drawing.Color.Green;
}
}
Demo

 

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4 comments :

Karan Reddy said...

Nice Program! Thanks

Saurabh said...
This comment has been removed by the author.
Anonymous said...

I don't understand the regular expression part. Plz explain in detail.Sorry i'm fresher in asp .net with c#. Thank you.

Anonymous said...

If I don't want to use a submit button what can I use?

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