using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

​

class Program

{

    static void Main()

    {

        string inputString = "   This  is   a    sample   string    with   multiple    spaces.   ";

        List<string> result = ParseWords(inputString);

​

        foreach (string word in result)

        {

            Console.WriteLine(word);

        }

    }

​

    static List<string> ParseWords(string input)

    {

        // The regex pattern \b\w+\b matches one or more word characters (\w) surrounded by word boundaries (\b)

        string pattern = @"\b\w+\b";

        Regex regex = new Regex(pattern);

​

        // Use Matches to get all matches in the input string

        MatchCollection matches = regex.Matches(input);

​

        // Convert the MatchCollection to a List<string>

        List<string> words = new List<string>();

        foreach (Match match in matches)

        {

            words.Add(match.Value);

        }

​

        return words;

    }

}

​