<p>Just a <a href="/url/">URL</a>.
</p>
<p><a href="/url/" title="title">URL and title</a>.
</p>
<p><a href="/url/" title="title preceded by two spaces">URL and title</a>.
</p>
<p><a href="/url/" title="title preceded by a tab">URL and title</a>.
</p>
<p><a href="">Empty</a>.
</p>