(?<=to |^).*?(?= to|$)

string[] names = Regex.Matches("Yuvraj Singh to Nasir Jamshed to Kumar to Shoaib Malik", "(?<=to |^).*?(?= to|$)")
                      .Cast<Match>()
                      .Select(m => m.Value)
                      .ToArray();

([A-Z][w-]*s*)+