/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
/* 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 s = "https://a...content-available-to-author-only...s.com/somestring/somestring-2/c100.200.3.4/somestrigx3/somestring.4";
		Pattern pattern = Pattern.compile("(?<=/c)(\\d+)|(?!^)\\G\\.(\\d+)");
		Matcher matcher = pattern.matcher(s);
		while (matcher.find()){
			if (matcher.group(1) != null)
				System.out.println(matcher.group(1));
			if (matcher.group(2) != null)
				System.out.println(matcher.group(2)); 
		} 
	}
}

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