ref: 99ed32c9f5a5aaf6b32ebb49ce5c7045ffe7d0b0 dir: /sys/lib/plumb/fileaddr/
addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])' addr=:($addrelem([,;+\-]$addrelem)*)