class EntityTag {

    public static boolean isValid(@Nullable final CharSequence entityTag) {
        boolean result = false;
        if (null != entityTag) {
            final Matcher matcher = ENTITY_TAG_REGEX_PATTERN.matcher(entityTag);
            result = matcher.matches();
        }
        return result;
    }

    private  EntityTag(final boolean weak, final String opaqueTag);

}