Getting TrainzScript sheat

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


namespace DefaultGSNamesCrawler
{
    static class Util
    {
        public static void ForEach(this MatchCollection matches, Action<Match> action)
        {
            for (int i = 0; i < matches.Count; i++) {
                action(matches[i]);
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var path = args[0];
            var files = Directory.GetFiles(path, "*.gs");

            var classes = new HashSet<string>();
            var methods = new HashSet<string>();
            var constants = new HashSet<string>();
            var classRegexp = new Regex(@"^\s*(\w+\s+)*class\s+(\w+)\b",
                                        RegexOptions.Multiline | RegexOptions.Compiled);
            var methodRegexp = new Regex(@"^\s*((?:\w+\s+)*)(\w+)\s+(\w+)\s*\(",
                                        RegexOptions.Multiline | RegexOptions.Compiled);
            var constantRegexp = new Regex(@"^\s*((?:\w+\s+)*define\s+(?:\w+\s+)*)(\w+)\s+(\w+)\s*=",
                                        RegexOptions.Multiline | RegexOptions.Compiled);
            foreach (var file in files) {
                var contents = File.ReadAllText(file);

                classRegexp.Matches(contents).ForEach(m => classes.Add(m.Groups[2].Value));
                methodRegexp.Matches(contents).ForEach(m => {
                                                           if (m.Groups[1].Value.Contains("public"))
                                                               methods.Add(m.Groups[3].Value);
                                                       });
                constantRegexp.Matches(contents).ForEach(m => {
                    if (m.Groups[1].Value.Contains("public"))
                        constants.Add(m.Groups[3].Value);
                });
            }

            var output = new StringBuilder();
            output.AppendFormat(@"\b({0})\b", String.Join("|", classes.OrderBy(s => s).ToArray()));
            output.AppendLine();
            output.AppendFormat(@"\b({0})\b", String.Join("|", methods.OrderBy(s => s).ToArray()));
            output.AppendLine();
            output.AppendFormat(@"\b({0})\b", String.Join("|", constants.OrderBy(s => s).ToArray()));
            File.WriteAllText("output.txt", output.ToString());
        }
    }
}