gistfile1.txt

  IP_REGEX = /
\A          # starts with
\d+         # some digits, iface number
\:\s        # colon literal followed by a space
(\S+)       # some non-whitespace, iface name, $1
\s+         # some spaces
inet\s      # inet (v4) designation
([\d\.\/]+) # start IPv4/CIDR capture
/x