using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

         String str = "blue bottle in on blue table";

         string[] source = str.Split(new char[] { '.', '?', '!', ' ', ';', ':', ',' }, StringSplitOptions.RemoveEmptyEntries);  

         string searchTerm = "blue";

         var matchQuery = from word in source  

                         where word.ToLowerInvariant() == searchTerm.ToLowerInvariant()  

                         select word;  

         Console.WriteLine(searchTerm + " > " + matchQuery.Count());

    }

}