sed - ipv4 찾아 현재 pub ip로 변경

#!/bin/sh

match='[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
ip="$(dig +short myip.opendns.com @resolver1.opendns.com)"
file='test.yml'

sed -i -e "s/$match/$ip/gi" $file