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Using regular expressions to reformat a URL in HTML

Posted on 2003-10-23
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Last Modified: 2012-06-27
Hello!

I'm having a hard time with regular expressions.
Basically, my goal is to format something like:

<img src="/images/pic.jpg" border=0>
<img border=0 src="images/pic.gif">

into

<img src="http://www.server.com/images/pic.jpg" border=0>
<img border=0 src="http://www.server.com/images/pic.gif">

Being new to regular expressions, this is as far as I got.
There is one catch, this expression MUST ignore entries with the server already specified.. ie: http://www.server.com/images/pic.gif


eregi_replace("src=\"(((\.\.)*/)|(^images))((([A-Za-z0-9.\-_])*)([A-Za-z0-9./-_])*)","src=\"".$url."\\5",$body);

I'm hoping someone out there can give me a hand!

Thanks a lot!
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Comment
Question by:bot_alpha
3 Comments
 
LVL 1

Expert Comment

by:robsmart
ID: 9614603
$url = 'http://robsmart.com/';

$html = '<br><img border=0 src="images/pic.gif"><br>';

$html = eregi_replace('(.*src=\")\/*(images.*)','\\1'.$url.'\\2',$html);


this should do what you want.

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LVL 11

Accepted Solution

by:
shmert earned 500 total points
ID: 9615241
Try this:
<?php
$html = <<<EOT
        <img src="/images/pic.jpg" border=0>
        <img border=0 src="images/pic.gif">
        <img border=0 src="http://absolute_url.com/images/pic.gif">
EOT;

$base_href = 'http://www.server.com';
$pattern = '|src="(/?)([^(http)][^"]*)"|i';
$html = preg_replace($pattern, "src=\"$base_href/\\2\"", $html);

echo '<pre>';
echo htmlspecialchars($html);
echo '</pre>';
?>

Note:  you should be able to achieve the same end result by using <base href="http://www.server.com"> in the HTML <head> section.
0
 

Author Comment

by:bot_alpha
ID: 9615767
Thanks for your quick replies!

I couldn't use <base href="http://www.server.com"> because of the way this particular application was designed.

Great job!
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