pr 13 № 9

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

namespace ForDZ
{
    class pr_13_9
    {
        public static void Task()
        {
            string[] input = {
                "Hello, I am a string.",
                "This program is free-software; you can copy it.",
                "This program is    free-software; you can copy it.",
                "This program is Free-software; you can copy it.",
                "In his house at Rl-yeh dead Cthulhu waits dreaming.",
                "Ph-nglui mglw-mafh Cthulhu R-lyeh wgah-nagl fhtagn.",
                 "Is this string work.",
                 "First test text. Is it work.",
            };

            string abbreviation = "([A-Z]+)";
            string first_latter_big = "(([A-Z])([a-z]*))";
            string first_latter_low = "([a-z]+)"; ;
            string word_first_part = "(" + first_latter_big + "|" + first_latter_low + ")";
            string word_second_part = "((-" + first_latter_low + ")?)";
            string lower_word = "(" + word_first_part + word_second_part + ")";
            string first_lower_word = "(" + first_latter_big + word_second_part + ")";
            string word = "(" + abbreviation + "|" + lower_word + ")";
            string first_word = "(" + abbreviation + "|" + first_lower_word + ")";
            string separators = @"((( - ){1})|((, ){1})|((; ){1})|((, - ){1})|(( ){1}))"; //"((;)|(((,)?)(( ){1})((- )?)))";
            string final = @"((...)|(\?)|(!)|(.))";
            string sentence = "(" + first_word + "(" + separators + word + ")*" + final + ")";

            string expression = "^(" + sentence + "(( )" + sentence + ")*)$";
            Regex regex = new Regex(expression);

            test(regex, input);
        }

        static void test(Regex regex, string[] inp)
        {
            foreach (string s in inp)
            {
                string t = regex.Match(s).Value;
                //Console.WriteLine($"> {s} ({s.Length}) -> {t} ({t.Length}) : {s.Length == t.Length}");
                Console.WriteLine($"> {s} -> {(s.Length == t.Length ? "YES" : "NO")}");
            }
            Console.WriteLine();
            Console.WriteLine();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            pr_13_9.Task();

            Console.WriteLine("\n\nend.");
            Console.ReadKey();
        }
    }
}