.Net Regular Expressions - Finding Acronyms, and Reversing the Stack - Sample Program

gistfile1.cs

using System;
using System.Text;
using System.Text.RegularExpressions;

// code for http://kobikobi.wordpress.com/2011/01/04/net-regular-expressions-finding-acronyms-and-reversing-the-stack/

public class Test
{
    public static void Main()
    {
        string findAcronyms = @"
\b((?<Acronym>\w)\w*\W+)+
(?<=(?<-Acronym>.(?=.*?(?<Reverse>\k<Acronym>)))+)(?(Acronym)(?!))
\((?<-Reverse>\k<Reverse>)+\)
(?(Reverse)(?!))";
        string input = @"Hello World (hw) and maybe Home work (HW),
And this: Are We Going To Have To Go Through ALL This Again? (AWGTHTGTATA),
but not this (tn), a b c (Abc) d e f (ef) g (g) , yooo (o),
From beneath you, it devours (fbyid)";
        MatchCollection matches = Regex.Matches(input, findAcronyms,
                    RegexOptions.IgnorePatternWhitespace | RegexOptions.ExplicitCapture | RegexOptions.IgnoreCase);
        foreach (Match match in matches)
        {
            Console.WriteLine(match.Value);
        }
        Console.ReadKey();
    }
}

Output.txt

Hello World (hw)
Home work (HW)
Are We Going To Have To Go Through ALL This Again? (AWGTHTGTATA)
a b c (Abc)
e f (ef)
g (g)
From beneath you, it devours (fbyid)