using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;
using System.Reflection;
public class MainClass{
public static void Main(){
Regex r = new Regex("(abc)*abc((abcd)|z)bc");
Console.WriteLine(r.IsMatch("abcabcabcdbc"));
}
}
True