if (patterns == null) {
            final String refs = getApiSearchAcceptReferers();
            if (StringUtil.isBlank(refs)) {
                patterns = new Pattern[0];
            } else {
                patterns = split(refs, "\n").get(

                return url;
            }
            return null;
        }).filter(s -> s != null).collect(Collectors.joining(", "));
        if (refs.isEmpty()) {
            return msg.getContent();
        }
        return "[References: " + refs + "]";
    }

    /**
     * Builds a truncated version of the assistant message content.
     *
     * @param msg the assistant chat message