startrule: network_object(s)
ip:     'ip' '=' /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/
ip_nosemi:      'ip' '=' /\d{1,3}\.\d{1,3}\.\d{1,3}\.d{1,3}/
mask:   /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3};/
host: /host:\w+/ '=' '{' ip(s) '}'
host_range: /host:\w+/ '=' '{' 'range' '=' ip_nosemi '-' ip '}'
hosts_or_range: host(s?) | host_range
#hosts_or_range:        host(s?) <score: 2> | host_range <score: 1>
network_object: /network:(\w+)/ '=' '{'
        ip 'mask' '=' mask hosts_or_range '}'
        { print "Found network object named $item[1] " . 
                "with IP $item{ip} and MASK $item{mask}\n"; }