/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String uri1 =  "https://m...content-available-to-author-only...d.com/123/1234567890128/456/1111";
		String uri2 = "https://m...content-available-to-author-only...d.com/123/1234567890128";
		String uri3 = "https://m...content-available-to-author-only...d.com/123/1234567890128/456/111122222222222222222";
		String pattern = "https?://.*/123/[0-9]{13}(?:/456/[0-9]{1,20})?";
 
		System.out.println(uri1.matches(pattern));
		System.out.println(uri2.matches(pattern));
		System.out.println(uri3.matches(pattern));
	}
}

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