ref: a945c6f5b1f69b9bf7a6a3a5404b14b9fe6c5e5c dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)