Remove style attribute from HTML tags

Question

I'm not too good with regular expressions, but with PHP I'm wanting to remove the style attribute from HTML tags in a string that's coming back from TinyMCE.

So change <p style="...">Text</p> to just vanilla <p>Test</p>.

How would I achieve this with something like the preg_replace() function?

Answer 1

The pragmatic regex (<[^>]+) style=".*?" will solve this problem in all reasonable cases. The part of the match that is not the first captured group should be removed, like this:

$output = preg_replace('/(<[^>]+) style=".*?"/i', '$1', $input); 

Match a < followed by one or more "not >" until we come to space and the style="..." part. The /i makes it work even with STYLE="...". Replace this match with $1, which is the captured group. It will leave the tag as is, if the tag doesn't include style="...".

Answer 2

Something like this should work (untested code warning):

<?php  $html = '<p style="asd">qwe</p><br /><p class="qwe">qweqweqwe</p>';  $domd = new DOMDocument(); libxml_use_internal_errors(true); $domd->loadHTML($html); libxml_use_internal_errors(false);  $domx = new DOMXPath($domd); $items = $domx->query("//p[@style]");  foreach($items as $item) {   $item->removeAttribute("style"); }  echo $domd->saveHTML();