What is the correct way to build a regular expression preg_replace?

Question

PHP

Not strong in regulars. Help me compose a regular expression to remove all attributes/styles from tags, except for tags: img,table,td,tr,a
I only got as far as removing all attributes myself:

$html_no_attr = preg_replace('#(</?\w+)(?:\s(?:[^<>/]|/[^<>])*)?(/?>)#ui', '$1$2', $html);

Answer 1

If you need to carefully (for example, you want to keep align= in the code), then so
If it's hardcore, it's like this:

$text = preg_replace("/<div(.*?)>/ism", "<div>", $text);