mail check voor kevin

using System.Text.RegularExpressions;

public static class MailString
{
	static Regex ValidEmailRegex = CreateValidEmailRegex();

	private static Regex CreateValidEmailRegex ()
	{
		string validEmailPattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|" + @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)" + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";
		return new Regex( validEmailPattern, RegexOptions.IgnoreCase );
	}

	internal static bool isEmailValid (string emailAddress)
	{
		if (!((!string.IsNullOrEmpty( emailAddress )) && ValidEmailRegex.IsMatch( emailAddress )))
		{
			return false;
		}

		return true;
	}
}