Finding URLs and in particular URLs to KTH Play

Sometimes it is useful to know what URLs you refer to in your pages. To do this I made a simple program https://gitr.sys.kth.se/maguire/Canvas/blob/master/compute_list_of_URLs_on_pages_in_course.py 

From this it was easy to make a program to just collects those URLs that point to KTH Play (i.e., play.kth.se), see https://gitr.sys.kth.se/maguire/Canvas/blob/master/compute_list_of_KTH_play_URLs_on_pages_in_course.py

It is even possible to make a program that can collect all of the URLs mentioned in a page, but that are not links: https://gitr.sys.kth.se/maguire/Canvas/blob/master/compute_list_of_URLs_in_text_on_pages_in_course.py