-- input --
The Go home page is https://go.dev/.
It used to be https://golang.org.
https:// is not a link.
Nor is https://
https://☺ is not a link.
https://:80 is not a link.

-- gofmt --
The Go home page is https://go.dev/.
It used to be https://golang.org.
https:// is not a link.
Nor is https://
https://☺ is not a link.
https://:80 is not a link.

-- text --
The Go home page is https://go.dev/. It used to be https://golang.org. https://
is not a link. Nor is https:// https://☺ is not a link. https://:80 is not a
link.

-- markdown --
The Go home page is [https://go.dev/](https://go.dev/). It used to be [https://golang.org](https://golang.org). https:// is not a link. Nor is https:// https://☺ is not a link. https://:80 is not a link.

-- html --
<p>The Go home page is <a href="https://go.dev/">https://go.dev/</a>.
It used to be <a href="https://golang.org">https://golang.org</a>.
https:// is not a link.
Nor is https://
https://☺ is not a link.
https://:80 is not a link.