/usr/share/cups/ppd-updaters/printer-driver-foo2zjs-common.ppd-updater is in printer-driver-foo2zjs-common 20170320dfsg0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | DRIVER_REGEXP='^foo2zjs:'
GENNICKNAME_REGEXP='s/-z\d\b//'
|