Regular Expression Basics C# Book


            using System;
using System.Text.RegularExpressions;
class Program
{
 static void Main(string[] args)
 {
 string r = @"\b(\w|[-'])+\b"; 
 
 string text = "This is a test"; 
 Console.WriteLine (Regex.Matches (text, r).Count); 
 }
}
The output:
4