using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		var tekst = "№\tВопрос\tОтвет   \n1 \tДата звонка \t08.08.2014   \n2 \tВремя звонка \t16:30  \n3 \tИмя оператора \tИванов Иван  \n4 \tНомер телефона абонента \t84957777777  \n5 \tКто звонит   \n6 \tНомер карты  \n7 \tПрепарат  \n8 \tТелефон  \n9 \tКомментарий 	тест звонок   ";
    	var s = @"\p{Zs}*";
    	var z = @"[^\r\n\t]+";
    	var TdPattern = new Regex(
                $@"^{s}(\d+){s}\t{s}({z})(?:\t{s}({z}){s})?\r?$", // ^\p{Zs}*(\d+)\p{Zs}*\t\p{Zs}*([^\r\n\t]+)(?:\t\p{Zs}*([^\r\n\t]*)\p{Zs}*)?\r?$
                RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline);  
    	var result = TdPattern.Matches(tekst);
        foreach (Match m in result) {
        	Console.WriteLine(m.Groups[1].Value);
        	Console.WriteLine(m.Groups[2].Value);
        	if (m.Groups[3].Success) Console.WriteLine(m.Groups[3].Value);
        	Console.WriteLine("---------------");
        }
	}
}

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