syntax: regexp
^sys/src/.*\.[ao]?[12578vqki]?$
^sys/src/(.*/)?[12578vqki]\..*$
^sys/lib/python/.*\.(pyo|pyc|exe)$
^(dev|fd|net|srv|env|root|boot|mnt|n|bin|tmp)/
^(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)/(bin|lib)/
^386/(9(pc|boot).*|pbs|mbr|init)
^acme/bin/(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)/
^usr/
^sys/lib/pkg