Searching string with special characters in MongoDB document

java

    /**
     * Searching string with special characters in MongoDB document
     * @param keyword string with special characters
     * @return pattern, e.g. Criteria.where(field).regex(pattern);
     */
    public static Pattern generatePattern(String keyword) {
        checkArgument(StringUtils.isNotEmpty(keyword));

        keyword = keyword.replace("*", "\\*")
                .replace(".", "\\.");
        return Pattern.compile("^.*" + keyword + ".*$", Pattern.CASE_INSENSITIVE);
    }