GFM autolink extension (www. part): the word www matches

[wooorm]

a www. b

Yields:

a www. b

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It seems that when www. is found, it is then parsed again as a domain, of which the dot makes it valid, and then it gets truncated to exclude the dot.
Instead, I think a domain (with a dot) should be parsed after www..

a www.example b (probably not this one either)
a www.example.com b (this should of course work)

a www.example b (probably not this one either)
a www.example.com b (this should of course work)

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Aside, it seems like dots aren’t needed at all:

https://example.com

https://example

http://example.com

http://example.com

www.example.com

www.example

https://example.com

https://example

http://example.com

http://example.com

www.example.com

www.example