using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Linq;
 
public class Test
{
 	private static string LookupReplace(string text, List<string> newList)
 	{
		return "~" + newList.IndexOf(text).ToString() + "~";
 	}
 
  	private static string NumberedReplace()
 	{
		i++;
		return "~" + i.ToString() + "~";
 	}
 
    public static int i = -1;
 
    public static void Main()
    {   
        string text = "iif(instr(|Wellington, New Zealand|,|,|)>0,|Wellington, New Zealand|,|Wellington, New Zealand| & |, | & |New Zealand|) & | to | & iif(instr(|Jeddah, Saudi Arabia|,|,|)>0,|Jeddah, Saudi Arabia|,|Jeddah, Saudi Arabia| & |, | & |Saudi Arabia|) & iif(|Jeddah, Saudi Arabia|=||,||,| via | & |Jeddah, Saudi Arabia|)";
        var re = new Regex(@"\|.*?\|");
        var newList = re.Matches(text)
            			.OfType<Match>()
            			.Select(m => m.Value)
    					.ToList();
        string result = re.Replace(text, x => LookupReplace(x.Value, newList));
        Console.WriteLine(result);
 
        result = re.Replace(text, x => NumberedReplace());
        Console.WriteLine(result);
    }
 
}

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