to_hex () {
    echo $1 | while read -n 1 char; do
        echo -n $char | xxd -p | tr '\n' ','
    done
    echo -n '00'
}

base0='1001'
base1='00'
servername=$1
region='1'
url=$2

echo "REGEDIT4

[HKEY_CURRENT_USER\Software\Blizzard Entertainment\Warcraft III]
\"Battle.net Gateways\"=hex(7):$(to_hex $base0),$(to_hex $base1),$(to_hex $servername),$(to_hex $region),$(to_hex $url),00"