Word Count Algorithm in C#

Question

I am looking for a good word count class or function. When I copy and paste something from the internet and compare it with my custom word count algorithm and MS Word it is

Answer 1

Use a regular expression to find words (e.g. [\w]+) and just count the matches

public static Regex regex = new Regex(
  "[\\w]+",
RegexOptions.Multiline
| RegexOptions.CultureInvariant
| RegexOptions.Compiled
);

regex.Match(_someString).Count