regexe pattern matching

I have a file that has repeated pattern of following.

<table id=ABCd009 class=x100>
<tr style='cursorointer' onclick='On(97508054)'>
<td class=myclass><img src=/i/image.gif></td>
<td class='head x100' style='background-color:#f8fbff'>This is a test of my programming skiils and i was found to be dumb <B class=h5>dumb </B>I am ashamed.
</td>
</tr>
</table>

I am trying to use preg_match_all to find if there was a keyword "skiils" in
<td class='head x100' style='background-color:#f8fbff'>This is a test of my programming skiils and i was found to be dumb <B class=h5>dumb </B>I am ashamed.
</td>
I have tried several combination of pattern that I think should return the match but nothing works. This is the one i tried last but nosuccess.
$Key_RE = "(<td.*>).*(skiils).*(</td>)";

Can anybody help me making that pattern string

 

<?
$html = <<< HTML
<table id=ABCd009 class=x100>
<tr style='cursor:pointer' onclick='On(97508054)'>
<td class=myclass><img src=/i/image.gif></td>
<td class='head x100' style='background-color:#f8fbff'>This is a test of my programming skiils and i was found to be dumb <B class=h5>dumb </B>I am ashamed.
</td>
</tr>
</table>
HTML;

$html = strip_tags($html, "<td>");

preg_match_all("/<td(?:[^>]*)>(?:[^<]*)(skiils)(?:[^<]*)<\/td>/i", $html, $matches);
header("Content-type: text/plain");
print_r($matches);
?>

PHP:

Prints:

Array
(
    [0] => Array
        (
            [0] => <td class='head x100' style='background-color:#f8fbff'>This is a test of my programming skiils and i was found to be dumb dumb I am ashamed.
</td>
        )

    [1] => Array
        (
            [0] => skiils
        )

)

Code (markup):

Yes, I had it strip all the other HTML tags first. You get the idea.