Simple location check using geoip tool

#!/bin/bash

usage () {
    echo "usage: geoip <IP-address>"
}

ip_regexp=^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$

if [[ $1 =~ $ip_regexp ]]; then
    links -dump "http://www.geoiptool.com/en/?IP=$1" | grep -v "IMG" | head -n -1 | tail -n +9 | sed -e 's/[|]//g;s/+-*+//'
elif [[ $1 != $ip_regexp ]]; then
    echo "Specify valid IP address"
fi