bagofwords

bag.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace ConsoleApplication4{
    class Program{
        static string text = @"Functional programming is like describing your problem to a
    mathematician.  Imperative programming is like giving instructions to
    an idiot.
    -- arcus, #scheme on Freenode";
        private static IEnumerable<string> BagOfWords()
        {
            return Regex.Split(text.ToLower(), @"\W+")
                .GroupBy(x => x)
                .GroupBy(x => x.Count())
                .OrderByDescending(x => x.Key)
                .Select(x => String.Format("{0}:{1}", x.Key, String.Join(",", x.Select(y => y.Key))));
        }

        static void Main(string[] args){
            foreach (var str in BagOfWords())
            {
                Console.WriteLine(str);
            }
            Console.ReadKey();
        }
    }
}