LM | Zad 5

using System;
using System.Text.RegularExpressions;

namespace Zad_5
{
    class Program
    {
        static void Main(string[] args)
        {
            string pattern = @"^([-+]?[\(]?[0-9]*\.?[0-9]+[\)]?[-+*^/])+([-+]?[\(]?[0-9]*\.?[0-9]+[\)]?)$";
            /* GRAMATYKA
             * S ::= -A | A
             * A ::= B | (B)
             * B ::= C Z A
             * C ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
             * Z ::= + | - | * | / | ^
             */
            while(true)
            {
                Console.ForegroundColor = ConsoleColor.Gray;
                Console.WriteLine("\nPodaj wyrazenie do sprawdzenia (\"end\" konczy dzialanie): ");
                string str = Console.ReadLine();
                if (str == "end") break;

                Match match = new Regex(pattern).Match(str);

                if (match.Success) Console.ForegroundColor = ConsoleColor.Green;
                else Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine(str);
            }
        }
    }
}