ref: 9b33c34e9bd63b752f6b36f2ecc54e007cc5d2c4 dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)