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ASP.Net - Regular Expression to validate email id in C#.net

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ASPX Code:

<!DOCTYPE html>
<html>
<head id="Head1" runat="server">
    <title>ASP.Net - Regular Expression To Validate Email Address in C#.Net</title>
</head>
<body>
    <form id="frmValidate" name="frmValidate" runat="server">
    <div>
        <table border="1" cellpadding="5">
            <tr>
                <td>
                    Enter Email Id Here
                </td>
                <td>
                    <asp:TextBox ID="txtEmailId" runat="server"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    <asp:Button ID="btnValidateEmail" runat="server" Text="Check" OnClick="btnValidateEmail_Click" />
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <p style="color: Red;">
                        <asp:Label ID="lblValidEmail" runat="server"></asp:Label></p>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>

 C#.Net Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;

public partial class ValidateEmail : System.Web.UI.Page
{
    protected void btnValidateEmail_Click(object sender, EventArgs e)
    {
        //Check Email Id is valid
        if (IsValidEmailId(txtEmailId.Text))
        {
            lblValidEmail.Text = txtEmailId.Text + " is valid email";
        }
        else
        {
            lblValidEmail.Text = txtEmailId.Text + " is not valid email";
        }
    }
    //This function returns true if the emailid matches the pattern. Else it will return false
    private bool IsValidEmailId(string InputEmail)
    {
        //Regex To validate Email Address
        Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
        Match match = regex.Match(InputEmail);
        if (match.Success)
            return true;
        else
            return false;
    }

}

 Equivalent VB.Net Code;

Imports System.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Text.RegularExpressions

Partial Public Class ValidateEmail
    Inherits System.Web.UI.Page
    Protected Sub btnValidateEmail_Click(sender As Object, e As EventArgs)
        'Check Email Id is valid
        If IsValidEmailId(txtEmailId.Text) Then
            lblValidEmail.Text = txtEmailId.Text + " is valid email"
        Else
            lblValidEmail.Text = txtEmailId.Text + " is not valid email"
        End If
    End Sub
    'This function returns true if the emailid matches the pattern. Else it will return false
    Private Function IsValidEmailId(InputEmail As String) As Boolean
        'Regex To validate Email Address
        Dim regex As New Regex("^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$")
        Dim match As Match = regex.Match(InputEmail)
        If match.Success Then
            Return True
        Else
            Return False
        End If
    End Function

End Class



Labels:

Comments

  1. abbas7863:49 pm, November 17, 2014

    I need regular expression validation like below
    +(country code)-(area code)-(fax number)
    for example: +1-212-9876543
    with error-messages like if miss '-' then show 'missing '-''.
    if miss '+' then show 'missing '+''.

    ReplyDelete
  2. Unknown1:55 am, April 29, 2016

    After numerous StackOverflow research, and a few hours trying to code one myself....nothing.

    **head bangs against wall**

    One more attempt at researching a Regex.. and it works flawlessly! You're a genius!

    ReplyDelete

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