wertgit

  if (matcher.matches()) {
        // Handle as array 
        String fieldName = matcher.group(1);
        int index = Integer.parseInt(matcher.group(2));
        JSONArray newArrayStep;
        if (root.has(fieldName)) {
          newArrayStep = root.getJSONArray(fieldName);
        } else { 
          newArrayStep = new JSONArray();
          root.put(fieldName, newArrayStep);