regex find specific tables in html - php

Question

i have html like bottom of this. and using PHP
<table style="...">
<tbody>
<tr> <img id="foo" src="foo"/></tr>
</tbody>
</table>
<p> ....</p>
<table style="...">
<tbody>
<tr> <img id="bar" src="bar"/></tr
</tbody>
</table>
I'm beginning PHP.
I want to find specific table like img src or id equals foo or bar.
but selected both tables.
here is my regex
1.find tables has img tag
/<table.*?>.*?<img *.*?<\/table>/
-> selected 2 table
2.add img src
<table.*?<img.+(src=.*?foo).*?<\/table>
-> selected all, from first tag to last tag
3.so try to not include </table> between ... tag.
<table.*?(?!<\/table>).*?<img.+(src=.*?foo).*?<\/table>
-> same result
I don't know what is wrong!
I was solved using preg_match_all() but still want know preg_match()
has any idea??
thanks!

Answer 1

This job is much better suited to using PHPs DOMDocument and DOMXPath classes. In this case we use an xpath to search for a table which has a descendant which is an img with it's src attribute equal to either 'foo' or 'bar':
$doc = new DOMDocument();
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);
$footable = $xpath->query("//table[descendant::img[#src='foo']]");
echo $footable->item(0)->C14N() . "\n";
$bartable = $xpath->query("//table[descendant::img[#src='bar']]");
echo $bartable->item(0)->C14N() . "\n";
Output:
<table style="..."><tbody><tr><img id="foo" src="foo"></img></tr></tbody></table>
<table style="..."><tbody><tr><img id="bar" src="bar"></img></tr></tbody></table>
Demo on 3v4l.org