SOExample, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        class Test
        {
            public string arg { get; set; }
        }
        
        public static void Main(string[] args)
        {
            var items1 = new List<Test>();
            var items2 = new List<Test>();

items1.Add(new Test() { arg = "abc|def|ghi" });
            items1.Add(new Test() { arg = "abc|qjd|ghi" });
            items1.Add(new Test() { arg = "abc|def" });
            items1.Add(new Test() { arg = "abc|def|nnn" });
            items1.Add(new Test() { arg = "ghi" });

items2.Add(new Test() { arg = "ghi" });
            items2.Add(new Test() { arg = "def" });

var items =
                from b in items1
                from t in items2
                where b.arg == t.arg || b.arg.EndsWith("|" + t.arg)
                select new { B = b, T = t };

foreach (var val in items)
            {
                Console.WriteLine(string.Format("{0} matched {1}", val.T.arg, val.B.arg));
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,14 sec, cpu time: 0,14 sec, average memory usage: 16 Mb, average nr of threads: 3