}
        return StringUtil.EMPTY_STRINGS;
    }

    private String toLowerCase(final String term) {
        return term != null ? term.toLowerCase(Locale.ROOT) : term;
    }

    public void setRegexPrefix(final String regexPrefix) {
        this.regexPrefix = regexPrefix;
    }

    public void setQueryPlaceHolder(final String queryPlaceHolder) {
        this.queryPlaceHolder = queryPlaceHolder;
    }