using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string text = @"

​

        Every night    in my            dreams  I see you, I feel you

    That's how    I know you go on

​

Far across the  distance and            places between us   

​

​

​

You            have                 come                    to know you go on

​

​

​

​

​

​

​

​

";

            bool preserveTabs = false;

​

            //[Step 1]: Clean up white spaces around the text

            text = text.Trim();

            //Console.Write("\nTrim\n======\n" + text);

​

            //[Step 2]: Reduce repeated spaces to single space. 

            text = Regex.Replace(text, @" +", " ");

            // Console.Write("\nNo repeated spaces\n======\n" + text);

​

            //[Step 3]: Hande Tab spaces. Tabs needs to treated with care because 

                      //in some files tabs have special meaning (for eg Tab seperated files)

            if(preserveTabs)

            {

                text = Regex.Replace(text, @" *\t *", "\t");

            }

            else

            {

                text = Regex.Replace(text, @"[ \t]+", " ");

            }

            //Console.Write("\nTabs preserved\n======\n" + text);

​

            //[Step 4]: Reduce repeated new lines (and other white spaces around them)

                      //into a single new line.

            text = Regex.Replace(text, @"([\t ]*(\n)+[\t ]*)+", "\n");

            Console.Write("\nClean New Lines\n======\n" + text);    

    }

}