Stringregexp trying to capture date

Here is a sample of what I want to evaluate

<td class="bottomTableDate" rowspan="2">2013-05-26</td>
        <td class="bottomTableName" rowspan="2"><span class="standardTrailerName" itemprop="name">Trailer 6 - 5.1 Audio</span></td>

        <td class="bottomTableResolution"><a href="http://videos.hd-trailers.net/LONE-RANGER_TLR-6-480p-HDTN.mp4" rel="lightbox[res480p 852 480]" title="The Lone Ranger - Trailer 6 - 5.1 Audio - 480p">480p</a></td>
        <td class="bottomTableResolution"><a href="http://videos.hd-trailers.net/LONE-RANGER_TLR-6-720p-HDTN.mp4" rel="lightbox[res720p 1280 720]" title="The Lone Ranger - Trailer 6 - 5.1 Audio - 720p">720p</a></td>
        <td class="bottomTableResolution"><a href="http://videos.hd-trailers.net/LONE-RANGER_TLR-6-1080p-HDTN.mp4

END SAMPLE

I would like my start point to be the beginning of the file, and my end point to be one of the filenames, like the 1080p file,  I have tried alot of things.  im trying to extract the date, like this

$string = StringRegExp($i, '(\d\d\d\d-\d\d-\d\d)http://videos.hd-trailers.net/LONE-RANGER_TLR-6-1080p-HDTN.mp4', 3)
_ArrayDisplay ($string)

Im not sure if my issue is with whitespace, or something else.  Can someone point me in the right direction please?