public void checkGetDocIDFiled() {
        if (getDocByID.getText() != "" && getDocByID.getText() != null && getDocByID.getText().length() != 0) {
            List<String> docsID = Arrays.asList(getDocByID.getText().split("\\s*,\\s*"));
            for (int i = 0; i < docsID.size(); i++) {
                String regex = "[0-9]+";
                if (docsID.get(i).matches(regex)) {
                    listOfDocsSelectedByID.add(docsID.get(i));
                }
            }
        }
    }