using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

    static string[] inputs = {

        "'Test string','abc'",

        "'Test string','abc'",

        "'Test string ','abc'",

        "'Test string' ,'abc'",

        "'Test string', 'abc'",

        "'Test string   '   ,   'abc'",

        "'Test string','abc','John's test'"

    };

    public static void Main()

    {

        foreach (string i in inputs)

        {

            IEnumerable<String> spl = Split(i);

​

            Console.Write(String.Format("[{0}] = [{1}]", i, String.Join(", ", spl)));

​

            Console.WriteLine();

        }

    }

​

    public static IEnumerable<string> Split(string inpt)

    {

        IEnumerable<string> res = Regex.Split(inpt, @"('\s*,\s*'|^\s*'|'\s*$)").Where((x, i) => i % 2 == 0).Select(p => p.Trim()).Skip(1);

        return res.Take(res.Count() - 1);

    }

}