Matching SRC attribute of IMG tag using preg_match


Question

I'm attempting to run preg_match to extract the SRC attribute from the first IMG tag in an article (in this case, stored in $row->introtext).

preg_match('/\< *[img][^\>]*[src] *= *[\"\']{0,1}([^\"\']*)/i', $row->introtext, $matches);

Instead of getting something like

images/stories/otakuzoku1.jpg

from

<img src="images/stories/otakuzoku1.jpg" border="0" alt="Inside Otakuzoku's store" />

I get just

0

The regex should be right, but I can't tell why it appears to be matching the border attribute and not the src attribute.

Alternatively, if you've had the patience to read this far without skipping straight to the reply field and typing 'use a HTML/XML parser', can a good tutorial for one be recommended as I'm having trouble finding one at all that's applicable to PHP 4.

PHP 4.4.7

1
14
2/1/2010 9:36:22 PM

Accepted Answer

Your expression is incorrect. Try:

preg_match('/< *img[^>]*src *= *["\']?([^"\']*)/i', $row->introtext, $matches);

Note the removal of brackets around img and src and some other cleanups.

35
2/1/2010 9:45:18 PM

Here's a way to do it with built-in functions (php >= 4):

$parser = xml_parser_create();
xml_parse_into_struct($parser, $html, $values);
foreach ($values as $key => $val) {
    if ($val['tag'] == 'IMG') {
        $first_src = $val['attributes']['SRC'];
        break;
    }
}

echo $first_src;  // images/stories/otakuzoku1.jpg

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