ref: 47c48b42c3463844a3fa0ca0a9d6dbc8a2e8b0f6 dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)