Sub string from a word to another word

Since "cat" can be found inside of other words it is better to use Regex to extract hole words like in the code below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication21
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = "My cat is missing";
            string pattern = @"^(\w+\s?)+$";
            Regex expr = new Regex(pattern);
            Match match = expr.Match(input);
            Group group = match.Groups[1];
            foreach (Capture capture in group.Captures)
            {
                Console.WriteLine("Word : {0}", capture.ToString());
            }
        }
    }

}

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jdweng