RegEx to resize HTML-objects

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!

I don't know why you would want to do this but isn't adding a style easier? * { height: auto; width: auto } — Han Dijk, Mar 31 '11 at 15:28
[You can't parse (X)HTML with regex.](http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454) The fact that you have no experience isn't going to make it any better. — unholysampler, Mar 31 '11 at 15:30

vbence · Accepted Answer · 2011-03-31T17:13:03.097

2

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);

edited Mar 31 '11 at 17:13

answered Mar 31 '11 at 15:28

vbence

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@Emil Edited. I added some examples. – vbence Mar 31 '11 at 15:35
I'm pretty sure that the `*` in Emil's question is meant as a wildcard, not a literal asterisk... – Tim Pietzcker Mar 31 '11 at 15:45
1

@Tim You may be right. Let's wait until he replies. - In that case obviusly you can replace `\*` with `[^"]*` . . . – vbence Mar 31 '11 at 15:51
I had no idea str_replace worked with wildcards! Why isn't this documented anywhere..? Thanks! :) – Emil Mar 31 '11 at 16:22
@Emil No, it does not work. I just misunderstood your question :) You have to use the regex pattern in my answer. – vbence Mar 31 '11 at 17:10

RegEx to resize HTML-objects

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