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

namespace re { class Program { public static void rgex(string input, string pattern) { Regex rg = new Regex(pattern); MatchCollection matchedReg = rg.Matches(input); input = ""; foreach (Match match in matchedReg) Console.WriteLine(match.Groups[0]); } static void Main(string[] args) { string input = ""; string line; while((line= Console.ReadLine())!=null){ input += line; input += ' '; } input = input.Remove(input.Length-1); string pattern = @"(?:[a-zA-Z]+[a-zA-Z0-9]*)(?:\[(?:[a-zA-Z]+[a-zA-Z0-9]*|[0-9]+)\])?(?:\s*)(?:\=)(?:\s*)(?:[0-9]+|(?:(?:[a-zA-Z]+[a-zA-Z0-9]*(?:\[(?:[a-zA-Z]+[a-zA-Z0-9]*|[0-9]+)\])?)+)|(?:\s*)(?:(?:(?:[1-9]+(?:0*))+|0|(?:[a-zA-Z]+[a-zA-Z0-9]*(?:\[(?:[a-zA-Z]+[a-zA-Z0-9]*|(?:[1-9]+(?:0*))+|0)\])?)+)(?:\s*)(?:(?:[+\-*\/])(?:\s*)(?:(?:[1-9]+(?:0*))+|0|(?:[a-zA-Z]+[a-zA-Z0-9]*))(?:\[(?:[a-zA-Z]+[a-zA-Z0-9]*|[0-9]+)\])?(?:\s*))+)+)(?:\s*)(?:\;)"; rgex(input, pattern); } } }

How to decompose the pattern into several short strings to make it more readable without affecting the function of the code, please give the decomposed short string