a bash script decode and clean decoded hexstring

hex-decode.sh

echo "\n=-=-=-=-=-=-=-=-=-=-=-= Input hexstring -=-=-=-=-=-=-=-=-=-=\n"
read input
echo "\n=-=-=-=-=-=-=-=-=-=-=-=-=  DECODED  -=-=-=-=-=-=-=-=-=-=-=-=\n"
decode() {
	echo $1 | xxd -r -p
}

OUTPUT="$(decode $input)"
CLEAN=${OUTPUT//[^a-zA-Z0-9_]/.}

echo $CLEAN  
echo "\n\n=-=-=-=-=-=-=-=-=-=-=-=-= FINISHED EXECUTION \n"
exit
;;