# can only extract feed from URL if it's chirbit.com
if [[ $url == *"chirbit.com/"* ]]
then
	# get username (cut off https://www.chirbit.com/ from front)
	username=${url##*chirbit.com/}

	# cut off any extra stuff from end
	username=${username%%/*}

	if [[ -n $username ]]
	then
		# prepend chirbit URL and append /rss to form feed
		rss="https://www.chirbit.com/${username}/rss"
		url_ext=$rss
	fi
fi