Regex Email validation

Question

I use this

@\"^([\\w\\.\\-]+)@([\\w\\-]+)((\\.(\\w){2,3})+)$\"

regexp to validate the email

([\\w\\.\\-]+) - this is f

Answer 1

here is our Regex for this case:

@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
                       @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
                       @".)+))([a-zA-Z]{2,6}|[0-9]{1,3})(\]?)$",

there are three parts, which are checcked. the last one is propably the one you need. the specific term {2,6} indicates you the min/max length of the TLD at the end. HTH

Answer 2

public static bool ValidateEmail(string str)
{                       
     return Regex.IsMatch(str, @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
}

I use the above code to validate the email address.

Answer 3

   public bool VailidateEntriesForAccount()
    {
       if (!(txtMailId.Text.Trim() == string.Empty))
        {
            if (!IsEmail(txtMailId.Text))
            {
                Logger.Debug("Entered invalid Email ID's");
                MessageBox.Show("Please enter valid Email Id's" );
                txtMailId.Focus();
                return false;
            }
        }
     }
   private bool IsEmail(string strEmail)
    {
        Regex validateEmail = new Regex("^[\\W]*([\\w+\\-.%]+@[\\w\\-.]+\\.[A-Za-z] {2,4}[\\W]*,{1}[\\W]*)*([\\w+\\-.%]+@[\\w\\-.]+\\.[A-Za-z]{2,4})[\\W]*$");
        return validateEmail.IsMatch(strEmail);
    }

Answer 4

I think @"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$" should work.
You need to write it like

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 correct");
else
    Response.Write(email + " is incorrect");

Be warned that this will fail if:

1. There is a subdomain after the @ symbol.

2. You use a TLD with a length greater than 3, such as .info

Answer 5

Try the Following Code:

using System.Text.RegularExpressions;
if  (!Regex.IsMatch(txtEmail.Text, @"^[a-z,A-Z]{1,10}((-|.)\w+)*@\w+.\w{3}$"))
        MessageBox.Show("Not valid email.");

Answer 6

string patternEmail = @"(?<email>\w+@\w+\.[a-z]{0,3})";
Regex regexEmail = new Regex(patternEmail);