/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
 
/* 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 line = "Some info about stuff\nNotes: THis is a note about other stuff\nSo is this\n    And this\n\nThis is something else"; 
		String pattern = "(?s)Notes.*?(?=\n\n|$)";
		Pattern r = Pattern.compile(pattern);
		Matcher m = r.matcher(line);
 
		if (m.find()) {
		    System.out.println(m.group());
		}
	}
}

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