capture multi-line text
===

I've a html document..:

    <p>blah blah<p>
    <p>blah blah
    <br>blah blah</p>
    <p>blah blah
    <br>
        <br>
    blah blah</p>

And I want to remove double-breaking spaces. (can be found in last paragraph)

I tried this expression, but it will remove anything between first `<br>` and second `<br>`.
But I want to remove just last `<br>` (which comes right after another `<br>`, in next line):

    /<br>(.*?)<br>/s