preg_match? how to read within the td tags

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You don't need to use regular expressions, the DOM extension allows you to load an HTML document and do just about anything you like with it.

$html = new DOMDocument('1.0');
$html->loadHTML($htmlString);

$tds = $html->getElementsByTagName('td');

foreach ($tds as $td) {
    /* for inner XML / HTML functions - see user [url=http://uk2.php.net/manual/en/book.dom.php#73793]comment[/url] */
}