Posted by Jim on 10/29/07 20:49

Hi,

I'm trying to prefix the "src" attribute of all "img" elements with a
given string, $prefix. Here's what I've got:

preg_replace('/\<img(.+?)src="(?<!=http)(.+?)"(.+?)\/>/', '<img
$1src="' . $prefix . '$2"$3/>', $content);

The problem comes in that it always performs the replace, even when
there's an "http" in the source attribute.

Here's the source for a quick test if anyone's interested:

<?php

$prefix = 'http://mydomain.com/';

$content = <<<EOT
<img src="images/test.gif" alt="Test Image" />
<img src="http://shouldnt.be.changed/images/test.gif" alt="Test
Image" />
EOT;

echo preg_replace('/\<img(.+?)src="(?<!=http)(.+?)"(.+?)\/>/', '<img
$1src="' . $prefix . '$2"$3/>', $content);

/*
* First img element's src attribute should be changed, but not the
second's.
*/

?>

Thanks to all,

Jim.

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