Regex Collection Matching Example Split Email in C#

regex.cs

public string[] emailSplit(string email)
{
            string[] result = null;
            Regex exp = new Regex(@"^([^@]*)@(.*)", RegexOptions.IgnoreCase);
            MatchCollection matches = exp.Matches(email);
            if (matches.Count == 1 && matches[0].Groups.Count > 1)
            {
                Match m = matches[0];
                result = new string[m.Groups.Count -1];
                for (int i = 1; i < m.Groups.Count; i++)
                {
                    result[i-1] = m.Groups[i].Value;
                }
            }
            return result;
}