Create array of regex matches

Question

In Java, I am trying to return all regex matches to an array but it seems that you can only check whether the pattern matches something or not (boolean).

How can I u

Answer 1

        Set keyList = new HashSet();
        Pattern regex = Pattern.compile("#\\{(.*?)\\}");
        Matcher matcher = regex.matcher("Content goes here");
        while(matcher.find()) {
            keyList.add(matcher.group(1)); 
        }
        return keyList;