Email validation with regulara expressions in C#

	static string cutEmail(string str)
	{
	string email = null;
	Regex rx = new Regex(@"(?<email>[\w!#$%&'*+\-/=?\^_`{|}~]+(\.[\w!#$%&'*+\-/=?\^_`{|}~]+)*@((([\-\w]+\.)+[a-zA-Z]{2,4})|(([0-9]{1,3}\.){3}[0-9]{1,3})))", RegexOptions.None);
	Match match = rx.Match(str);
	if (match.Success)
	email = match.Groups["email"].Value;
	return email;
	}

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