https://github.github.com/gfm/#example-635
Further `/` characters are not considered part of the domain
......

xmpp:foo@bar.baz/txt/bin

......

<p data-sourcepos="1:1-1:24"><a data-sourcepos="1:1-1:20" href="xmpp:foo@bar.baz/txt">xmpp:foo@bar.baz/txt</a>/bin</p>