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

public class Test
{
	public static void Main()
	{
    	var s = "xxx (aaa - bbb CC - dd - ee-FFF) (aaa2 - bbb2 CC2- dd2- ee2-FFF2)";
    	var pattern = @"\((?<o>(?:(?! - )[^()])+)(?: - (?<o>(?:(?! - )[^()])+)){2,}\)";
    	var ms = Regex.Matches(s, pattern);
        foreach (Match m in ms) 
        {
        	Console.WriteLine($"Matched: {m.Value}");
        	var res = m.Groups["o"].Captures.Cast<Capture>().Select(x => x.Value);
        	Console.WriteLine(string.Join("; ", res));
        }
	}
}