# if page is a channel page, use canonical link to determine channel id
try1=`echo "$content" | grep -Po '(?<=<link rel="canonical" href="https://www.youtube.com/channel/).*?(?=">)'`
if [[ -n "$try1" ]]; then
	channel_id="$try1"
	
else
	# else (e.g., video page) extract just channel id from metadata
	try2=`echo "$content" | grep -Po '(?<="channelId":").+?(?=")' | head -1`
	if [[ -n "$try2" ]]; then
		channel_id="$try2"
	fi
fi

# if channel id successfully extracted
if [[ -n ${channel_id} ]]
then
	rss="https://www.youtube.com/feeds/videos.xml?channel_id=${channel_id}"
	page_ext=$rss
fi