RegEX以使用PHP匹配所有标签之间的匹配

Question

So I'm writing a script which will take everything between two div tags, the way I have it seemed to be working but it's not matching everything I noticed, I'm not sure why, whether it's because of line breaks, or any other issue. I want literally everything (including other html tags) matched.

     $aPost = preg_match_all('#<div class="posttext">(.*?)</div>#', $rThread, $aPosts);

It appears as if it's only matching whatever is written on one line with no line breaks, and if the div doesn't meet that criteria is ignores it entirely.

Answer 1

To fix your regex, use the dotall modifier which forces the . to match newline sequences:

preg_match_all('~<div class="posttext">(.*?)</div>~si', $rThread, $aPosts);

But, I would avoid using regex and make effective use of DOM and XPath to do this for you.

$doc = new DOMDocument;
@$doc->loadHTML($html); // load the HTML data

$xpath = new DOMXPath($doc);
$nodes = $xpath->query('//div[@class="posttext"]');

foreach ($nodes as $node) {
   echo $node->nodeValue, "\n";
}