using System;
    using System.Text.RegularExpressions;
     
    class Program {
    static void Main() {
    string value = @"apple, orange, ""baboons, cows"", rainbow, ""unicorns, gummy bears""";
    string[] lines = Regex.Split(value, @", (?=(?:""[^""]*?(?: [^""]*)*))|, (?=[^"",]+(?:,|$))");
     
    foreach (string line in lines) {
    Console.WriteLine(line);
    }
    }
    }