Linq query with OrderBy word count

Question

I have this bit of code,

 public static List<string> GetSentencesFromWords(List<string> words, string fileContents)
{
    return fileContents.Split('.')
        .Where(s => words.Any(w => s.IndexOf(w) != -1))
        .Select(s => s.TrimStart(' ') + ".")
        .ToList();
}

It works brilliantly, another user helped me with it in another question, but I thought my new question related to it warranted a new post. I need the returned word list to be ordered by the number of matches in each sentence. I have tried to do it a few ways but I am not very experienced with Linq and everything I have tried just seems to sort by sentence length rather than word count.

Answer 1

Try this and it should work for you?

return fileContents.Split('.')
    .Where(s => words.Any(w => s.IndexOf(w) != -1))
    .Select(s => s.TrimStart(' ') + ".")
    .OrderByDescending(s => words.Count(w => s.IndexOf(w) != -1))
    .ToList();

Answer 2

What about this:

return fileContents.Split('.')
   .Where(s => words.Any(w => s.Contains(w) != -1))
   .Select(s => s.TrimStart(' ') + ".")
   .OrderByDescending(s => words.Sum(w => Regex.Matches(s, w).Count))
   .ToList();

don't forget to include using System.Text.RegularExpressions