_pattern=${_arg#${PKG_DBDIR}/}
case ${_pattern} in
*\**|*-pl[0-9]*|*-[0-9]*[0-9.][a-z]|*-[0-9]*[0-9]) ;;
*\**|*-pl[0-9]*|*-b[0-9]*|*-[0-9]*[0-9.][a-z]|*-[0-9]*[0-9]) ;;
*) _pattern="${_pattern}-[0-9]*[0-9a-z]" ;;
esac