using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Linq;
public class Test
{
	public static void Main()
	{
		var s = "Foo: Some Text Bar: Some Other Text Foo-Bar: Even More Text";
		var res = Regex.Split(s, @"(?<!^)\s+(?=\b(?:Bar|Foo(?:-?Bar)?):)");
		Console.WriteLine(string.Join("\n", res));
		Console.WriteLine("--- Another idea ---");
		var matches = Regex.Matches(s, @"\w+(?:-\w+)*:.*?(?=\s*(?:\w+(?:-\w+)*:|$))", RegexOptions.Singleline)
		    .Cast<Match>()
		    .Select(x => x.Value)
		    .ToList();
        Console.WriteLine(string.Join("\n", matches));
	}
}