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copied!<p>This should do the trick, if I'm not mistaken:</p> <pre><code>preg_match_all('/height(\:|\=)"*\s*([0-9]+[^;"]+);*/i','<tr style="height: 123px; border: none;><tr height="125px"',$matches); var_dump($matches[2]);//array('123px','125px'); </code></pre> <p>But since you're going to let this regex loose on HTML (if I'm not mistaken), I'd look <a href="http://php.net/manual/en/class.domdocument.php" rel="nofollow">at ways to <em>parse</em> the DOM</a> and use the <a href="http://php.net/manual/en/class.domelement.php" rel="nofollow">DOMElement's</a> methods to get what I want. It's a far more robust take on the problem.</p> <p>As requested by OP:</p> <pre><code>function getDeepChildren($node,&$nodeArray) {//recursive function to flatten dom $current = $node->getElementsByTagName('*');//get all children foreach($current as $node) {//loop through children $nodeArray[] = $node;//add child if ($node->hasChildNodes()) {//if child node has children of its own getDeepChildren($node,$nodeArray);//get the children and append to nodeArray } } }//no return value, $nodeArray is passed by reference $dom = new DOMDocument(); $dom->loadHTML($body); $nodes = array(); getDeepChildren($dom,$nodes);//$nodes is passed by reference $height = array(); while($node = array_shift($nodes)) {//$height[i][0] === height value, $height[i][1] is reference to node if ($node->hasAttribute('height')) { $height[] = array($node->getAttribute('height'),$node); continue;//already got what we need, no need for slow preg_match //in case of <div height="123px" style="border:1px solid #F00;"> for example... } if ($node->hasAttribute('style') && preg_match('/height\s*\:\s*([0-9]+\s*[a-z]+)\s*;/i',$node->getAttribute('style'),$match)) { $height[] = array($match[1],$node); } } var_dump($height);//should contain everything you're looking for </code></pre> <p>For a more OO approach, I suggest looking at a couple of <a href="http://www.php.net/manual/en/class.domnodelist.php" rel="nofollow">recursive domnode iterator classes</a>.<br/>Passing arrays by reference is discouraged, but it's the easiest way to get what you need here. An alternative version would be:</p> <pre><code>function getDeepChildren($node) { $nodes = array(); $current = $node->getElementsByTagName('*'); foreach($current as $node) { $nodes[] = $node; if ($node->hasChildNodes()) { $nodes = array_merge($nodes,getDeepChildren($node)); } } return $nodes; } //instead of getDeepChildren($dom,$nodes), usage is: $nodes = getDeepChildren($dom); </code></pre>

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