# Valid grammars
hostname
host-name
host_name.domain
hostname and host_name.domain.tld
host1 or host2
host1 and host2
host1 and not host2
host10[10-20,30-50]
(hostname.domain.tld)
(host1 or host2) and host1
((host1[0-9] or host01) and host[01-10])
