cmark-gfm
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github
GFM autolink extension (`www.` part): uppercase does not match on issues/PRs/comments
The prefix www, for autolink literals, only matches when lowercase, in comments.
This is different from how the protocol prefix (http://, https://) is handled, which is matched case-insensitive.
It is also different from how www is matched on Gists or in markdown files in a repo.
To illustrate:
## WWW autolink literals
www.commonmark.org
Www.commonmark.org
wWw.commonmark.org
wwW.commonmark.org
WWW.COMMONMARK.ORG
## Protocol autolink literals
http://commonmark.org
https://commonmark.org
Http://commonmark.org
Https://commonmark.org
hTtp://commonmark.org
hTtps://commonmark.org
HTTP://commonmark.org
HTTPS://commonmark.org
WWW autolink literals
www.commonmark.org
Www.commonmark.org
wWw.commonmark.org
wwW.commonmark.org
WWW.COMMONMARK.ORG
Protocol autolink literals
http://commonmark.org
https://commonmark.org
Http://commonmark.org
Https://commonmark.org
hTtp://commonmark.org
hTtps://commonmark.org
HTTP://commonmark.org
HTTPS://commonmark.org
Pasting the above markdown in a private gist shows that each link is linked there.
If this is fixed in GFM the spec for autolinking should be updated as well.
