using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        foreach (var part in Split("Some text {MACRO(parameter1)} more text {MACRO(parameter2)}"))

            Console.WriteLine(">" + part + "<");

    }

    public static string[] Split(string input)

    {

        var regex = new Regex(@"{MACRO\(([^})]*)\)}");

        var lines = regex.Split(input);

        return lines;

    }

}