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?
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="...".