ref: 2f6c3ee3bcdfd540eb0d0bf8ce90a2a97e1f3850 dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)