ref: ae61eb9381f6b0c70e1c52bf2c2b7f4cd0b5bb6f dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)