Filter out homolog IP address, -i = invert

homolog.sh

#!/bin/bash
HOMO="\([0-9]\.\|[1]\{,1\}[0-9]\{2\}\.\|2[0-4][0-9]\.\|25[0-5]\.\)\{3\}\([0-9]\|[1]\{,1\}[0-9]\{2\}\|2[0-4][0-9]\|25[0-5]\)" 
LAN10="10\(\.[0-9]\|\.[1]\{,1\}[0-9]\{2\}\|\.2[0-4][0-9]\|\.25[0-5]\)\{3\}"
LAN172="172\.\(1[6-9]\|2[0-9]\|3[01]\)\.\([0-9]\.\|[1]\{,1\}[0-9]\{2\}\.\|2[0-4][0-9]\.\|25[0-5]\.\)\([0-9]\|[1]\{,1\}[0-9]\{2\}\|2[0-4][0-9]\|25[0-5]\)" 
LAN192168="192.168\(\.[0-9]\|\.[1]\{,1\}[0-9]\{2\}\|\.2[0-4][0-9]\|\.25[0-5]\)\{2\}"
LANSELF="127.0.0.1"
LANWEIRD="169.254.169.254"

case ${1} in
  "-i")
    OUT=$(cat - | grep -e ${LANSELF} -e ${LAN10} -e ${LAN172} -e ${LAN192168} | grep -v ${LANWEIRD}) 
  ;;
  *)
		OUT=$(cat - | grep -e ${HOMO})
		OUT=$(echo "${OUT}" | grep -v -e ${LANSELF})
		OUT=$(echo "${OUT}" | grep -v -e ${LAN10})
		OUT=$(echo "${OUT}" | grep -v -e ${LAN172})
		OUT=$(echo "${OUT}" | grep -v -e ${LAN192168})		
		OUT=$(echo "${OUT}" | grep -v -e ${LANWEIRD})		
  ;;
esac
echo "${OUT}"