* </pre>
     * @param property The property name for the message. (NotNull)
     * @param regexp The parameter regexp for message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addConstraintsPatternMessage(String property, String regexp) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(CONSTRAINTS_Pattern_MESSAGE, regexp));
        return this;
    }

    /**