Regex : how to get words from a string (C#)

Question

My input consists of user-posted strings.

What I want to do is create a dictionary with words, and how often they’ve been used. This means I want to parse a string,

Answer 1

I wrote an extension for String like this:

    private static string[] GetWords(string text)
    {
        List lstreturn = new List();
        List lst = text.Split(new[] { ' ' }).ToList();
        foreach (string str in lst)
        {
            if (str.Trim() == "")
            {
                lstreturn.Add(str);
            }
        }
        return lstreturn.ToArray();
    }