import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "# #.id\nendpoint/?userId=#someuser.id\nHi #someuser.name, how are you?";
		String regex = "#[^.#]*[^.#\\s][^#.]*\\.\\w+";
		Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(s);
		while (matcher.find()){
			System.out.println(matcher.group(0)); 
		} 
	}
}

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