Regex for validating multiple E-Mail-Addresses

Question

I got a Regex that validates my mail-addresses like this:

([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]

Answer 1

In an old regex book they stated that you cannot write a regex to match all valid email addresses (although you can come close).

Here is a website dealing with regex and email addresses.

I would recommend that you split the string at ; and , boundaries and check each email address separately for being valid/invalid with your regex.

Answer 2

Here is a simple Program which does this for you without using the Regular Expression.Well Actually it does use a regular expression but we don't have to worry about it how it looks .php does this for us .

public function test_reg()

{

   $email_list = '';

        $array = explode(";",$email_list);

        foreach ($array as $value)
         {
            $value;

            if (!filter_var($value, FILTER_VALIDATE_EMAIL) === false)
             {
                 $msg =  "Email List Contains  valid email addresses.";
              } 
            else
             {
                 $msg ="Your Email list contains an invalid email at. &nbsp&nbsp &nbsp".$value;
                 break;
             }  
         }

                echo $msg;



}

You have to separate your emails by a semi colon.

Answer 3

This is a very old question, but I figured I'd share my C# code.

I decided to parse by the semicolon then check each email individually:

string toAddress = "testemail@gmail.com;test2@testing.com;";
Regex rgx = new Regex(
    @"^[_a-z0-9-]+(\.[_a-z0-9-]+)*(\+[a-z0-9-]+)?@[a-z0-9-]+(\.[a-z0-9-]+)*$");

List<string> emailArray = new List<string>();

if(toAddress != null && toAddress != "")
{
    if (toAddress.IndexOf(";") != -1)
    {
        emailArray = toAddress.Replace(" ","").Split(';').ToList();
    }
    else
    {
        emailArray.Add(toAddress);
    }

    foreach (string email in emailArray)
    {
        if (rgx.IsMatch(email ?? ""))
        {
            SendEmail(email, subject, body);
        }
    }
}

Answer 4

Please try this

^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4};?)+$