1using System.Text.RegularExpressions;
2
3public static void SplitEmails()
4{
5    string addressList = "kip@abc; joe.bloggs@mac.com ,  bob.jones@xyz.net, abc.co.uk;a.jones@recfirst.com";
6    
7    // Extract emails, skipping blank entries

8    string[] emails = addressList.Split(new char[] {' ', ';', ',' }, StringSplitOptions.RemoveEmptyEntries);
9
10    // Print the valid emails.

11    string[] validEmails = Array.FindAll<string>(emails, IsValidEmail);
12    foreach (string validEmail in validEmails)
13    {
14        Console.WriteLine("Valid Email = " + validEmail);
15    }
16
17    // Print the invalid emails

18    string[] invalidEmails = Array.FindAll<string>(emails, IsInvalidEmail);
19    foreach (string invalidEmail in invalidEmails)
20    {
21        Console.WriteLine("Invalid Email = " + invalidEmail);
22    }
23}
24
25public static bool IsValidEmail(string email)
26{
27    string pattern =
28        @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
29        @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
30        @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
31    Regex re = new Regex(pattern);
32
33    return re.IsMatch(email);
34}
35
36public static bool IsInvalidEmail(string email)
37{
38    return !IsValidEmail(email);
39}
40

SplitEmails();