/**
     * Adds an include filter for URLs.
     * Only URLs matching this regular expression will be crawled.
     * @param regexp The regular expression for the include filter.
     */
    public void addIncludeFilter(final String regexp) {
        if (StringUtil.isNotBlank(regexp)) {
            urlFilter.addInclude(regexp);
        }
    }

    /**
     * Adds an exclude filter for URLs.

                        urlEncodeDisabled.set(false);
                    } else {
                        urlValue = systemHelper.encodeUrlFilter(line);
                    }
                    crawler.addIncludeFilter(urlValue);
                    if (logger.isInfoEnabled()) {
                        logger.info("Included URL: {}", urlValue);
                    }
                } else if (line.startsWith(DISABLE_URL_ENCODE)) {