def databases_to_archive(self):
        """
        Return a list of databases that are eligibles to archiving. If no
        database are provided or the * character is used the method basically
        do a SHOW DATABASE to get available databases
        The method exclude the databases that are explicitly excluded
        """
        if self._databases_to_archive:
            return self._databases_to_archive

        if self.databases is None or self.databases == '*':
            self._databases_to_archive = self.get_os_databases()
        else:
            self._databases_to_archive = [
                d for d in re.split(',|;|\n', self.databases.replace(' ', ''))
            ]

        excluded_databases_regex = \
            "^(" + "|".join(self.excluded_databases) + ")$"
        self._databases_to_archive = [
            d for d in self._databases_to_archive
            if not re.match(excluded_databases_regex, d)
        ]

        return self._databases_to_archive