/* 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 = "FILTER\ntest1\nORDER\ntest2\nFILTER\ntest3\nORDER\nFILTER\nORDER";
		Pattern pattern = Pattern.compile("(?s)FILTER(.*?)ORDER((?:(?!FILTER).)*)");
		Matcher matcher = pattern.matcher(s);
		List<String> results = new ArrayList<>();
		while (matcher.find()){
			if (matcher.group(1) != null) {
				results.add(matcher.group(1).trim());
			} 
			if (matcher.group(2) != null) {
				results.add(matcher.group(2).trim());
			} 
		} 
		System.out.println(results); 
	}
}

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