make_clickable() makes fake URLs clickables.

[piouPiouM]

If a string contains the words "ftp.", "www." or "​http://" (and its SSL variant), make_clickable() will convert them into clickable links.

Actual results:

ftp.     => <a rel="nofollow" href="http://ftp">http://ftp</a>.
www.     => <a rel="nofollow" href="http://www">http://www</a>.
http://  => <a rel="nofollow" href="http://">http://</a>
https:// => <a rel="nofollow" href="https://">https://</a>
ftp.example.com. => <a rel="nofollow" href="http://ftp.example.com">http://ftp.example.com</a>.

Expected results:

ftp.     => ftp.
www.     => www.
http://  => http://
https:// => https://
ftp.example.com. => <a rel="nofollow" href="http://ftp.example.com">http://ftp.example.com</a>.

[piouPiouM]

Attached patch

[ryan]

(In [10989]) make_clickable() regex fixes. Props piouPiouM. fixes #9390