using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string s = @"hey|this|is|a|pipe|separated|list|of|stuff|gilbane\kstewart|more|stuff|here";

        var match = Regex.Match(s,@"\|[^\\\|]+\\[^\\\|]+\|");

        Console.WriteLine(match.Value.TrimStart('|').TrimEnd('|'));

    }

}