4 операторы доделать тест 2

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

class MainClass
{
   public static void Main (string[] args)
  {
    string chislo = @"([1-9]\d*|[0])";
    string znach = @"[a-z0-9]";

    string correct_var = $@"([a-z]{znach}*|{chislo})";
    string in_mas = $@"(\s*{correct_var}\s*[-+*/])";
    string arifmetic_in_mas = $@"({in_mas}*\s*{correct_var}\s*)";

    string massiv = $@"[a-z]{znach}*(\[({correct_var}|{arifmetic_in_mas})\])";

    string fun = $@"[a-z]{znach}*(\(({correct_var}|{arifmetic_in_mas})\))";

    string arifmetic_var = $"({correct_var}|{massiv}|{fun})";
    string pattern_arifmetic = $@"(\s*{arifmetic_var}\s*[-+*/])";
    string long_pattern_arifmetic = $@"(({pattern_arifmetic}*)\s*{arifmetic_var})";

    string pattern = $@"([a-z]{znach}*|{massiv}|{fun})\s*=\s*({long_pattern_arifmetic}|{massiv}|{fun}|{chislo})\s*;";
    string str;

    while((str = Console.ReadLine())!= null)
      foreach (Match match in Regex.Matches(str, pattern))
         Console.WriteLine(match.Value);
  }
}