/* 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 output = "regulations { qux def } standards none rules { abc-123 456-defghi wxyz_678  } security { enabled }"; 
		String regex = "(?:\\brules\\s+\\{|(?!^)\\G)\\s+([\\w-]+)";
		final Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(output);
		while (matcher.find()) {
		    System.out.println(matcher.group(1));
		}
	}
}

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