Actually I'm now using: ^\w{3} [ :0-9]{11} [-._[:alnum:]]+ named\[[0-9]+\]: client [0-9.]{7,15}#[0-9]+: view (localhost|any|slave): query: [-._[:alnum:]]+ IN (CNAME|A6|AAAA|A|MX|PTR|TXT|NS|SOA|SSHFP) [-+](E?)$