using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        const string input = @"""""|*""I have delimiter |* and an escaped \"" quote  in me""|*100|*200|*300|*""am a string""|*""""";

        string[] result = Split(input, "|*", @"\""", false);

        foreach (string item in result)

        {

            Console.WriteLine(item);

        }

    }

    public static string[] Split(string expression, string delimiter, string qualifier, bool ignoreCase)

    {

        string _Statement = string.Format("{0}(?=(?:[^{1}]*{1}[^{1}]*{1})*(?![^{1}]*{1}))", Regex.Escape(delimiter), Regex.Escape(qualifier));

        RegexOptions _Options = RegexOptions.Compiled | RegexOptions.Multiline;

        if (ignoreCase) _Options = _Options | RegexOptions.IgnoreCase;

        Regex _Expression = new Regex(_Statement, _Options);

        return _Expression.Split(expression);

    }

}