Regex & LINQ: finding n-long words

using System;
using System.Linq;
using System.Diagnostics;
using System.Text.RegularExpressions;

namespace RegexLinqStringParsing
{
    class Program
    {
        static void Main(string[] args)
        {
            string noLongWords = "abcd abcd ab xyz sample test";
            string oneLongWordAtEnd = "xyz abc 88b zsy abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea";
            string oneLongWordAtBegining = "abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea xyz abc 88b zsy";
            string manyLongWordsEverywhere =
                @"abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea
                  abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea abcd xyz
                  abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea yz
                  abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdea";

            int iterations = 1000000;

            Linq(iterations, noLongWords, "noLongWords");
            Linq(iterations, oneLongWordAtEnd, "oneLongWordAtEnd");
            Linq(iterations, oneLongWordAtBegining, "oneLongWordAtBegining");
            Linq(iterations, manyLongWordsEverywhere, "manyLongWordsEverywhere");

            Regex(iterations, noLongWords, "noLongWords");
            Regex(iterations, oneLongWordAtEnd, "oneLongWordAtEnd");
            Regex(iterations, oneLongWordAtBegining, "oneLongWordAtBegining");
            Regex(iterations, manyLongWordsEverywhere, "manyLongWordsEverywhere");

            Console.WriteLine("DONE");
            Console.ReadLine();
        }

        private static void Linq(int iterations, string input, string inputName)
        {
            bool isLong = false;
            Stopwatch watch = new Stopwatch();
            watch.Start();
            for (int i = 0; i < iterations; i++)
            {
                isLong = input.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                                         .Any(s => s.Length > 50);
            }

            watch.Stop();
            Console.WriteLine("LINQ [{0}], {1} iterations. Result = {2}: {3} ms",
                inputName, iterations, isLong, watch.ElapsedMilliseconds);
        }

        private static void Regex(int iterations, string input, string inputName)
        {
            bool isLong = false;
            Regex regex = new Regex(@"(\w){50,}");
            Stopwatch watch = new Stopwatch();
            watch.Start();
            for (int i = 0; i < iterations; i++)
            {
                isLong = regex.IsMatch(input);
            }

            watch.Stop();
            Console.WriteLine("Regex [{0}], {1} iterations. Result = {2}: {3} ms",
                inputName, iterations, isLong, watch.ElapsedMilliseconds);
        }
    }
}