Question

I have absoulutely no experience with regular expressions, so I’ve run into a small issue.
I need to replace all height="*" and width="*"-html-tags with height="auto" and width="auto".

What regular expression can I use to accomplish this in PHP?
Thanks!

Answer 1

Note that this is only true for the literal asterisk character. For wildcards you should the regex after the update.

You don’t need regular expressions for this, just two str_replace()

$html = str_replace (' height="*"', ' height="auto"', $html);
$html = str_replace (' width="*"', ' width="auto"', $html);

Update

You can use RegEx though. It requires more resources, but some rudamentary checks can be added (so for example height="*" won’t be changed when NOT inside an element):

preg_replace ('/(<[^>]+ (height|width)=)"[^"]*"/i', '$1"auto"', $html);