$re = '~<div id="cphMain_pnl.*?Items".*?</div>~ms';
$str = '<div id="cphMain_pnlBreakfastItems" class="bp2-wdn-col-one-third">
<h4>blah blah</h4>
<span>content</span>
<span>other content</span>
</div>
<div id="cphMain_pnlLunchItems" class="bp2-wdn-col-one-third">
<h4>blah blah</h4>
<span>content</span>
<span>other content</span>
</div>
<div id="cphMain_pnlDinnerItems" class="bp2-wdn-col-one-third">
<h4>blah blah</h4>
<span>content</span>
<span>other content</span>
</div>';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php