ref: c28f07b5840216c4e83e1d3b21d8a9ed7c41f8f9 dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*):?