<p><a href="http://www.google.com/foobar">http://www.google.com/foobar</a></p>
<p><a href="http://www.google.com/foobar">www.google.com/foobar</a></p>
<p><a href="ftp://user:password@host.com:port/path">ftp://user:password@host.com:port/path</a></p>
<p>this has some <a href="http://www.google.com/foobar">http://www.google.com/foobar</a> in text</p>
<p>this has some <a href="http://www.google.com/foobar">www.google.com/foobar</a> in text</p>
<p>this has some <a href="ftp://user:password@host.com:port/path">ftp://user:password@host.com:port/path</a> in text</p>