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preg replace for links

Posted on 2009-05-08
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Last Modified: 2012-08-14
hello there,
I have a little function for links to replace them from a string and its working fine..
I would like to add something so that if there is an image inside the link to ignore the replace
for example this code does this




$post = preg_replace('/\[url="?([^\]"]+)[\]"].*/i', '$1', $post);

 

[URL="http://google1.com"]google is a search engine[/URL]

[URL=http://google2.com]google is a search engine[/URL]

[URL=http://googleimg.com][IMG]http://google.com/logo.jpg[/IMG][/URL]

 

into

 

http://google1.com

http://google2.com

http://googleimg.com

 

 

im trying to do something so if there is [img] tags inside the [url] to NOT do a replace...

how can I do that?

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Question by:XK8ER
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2 Comments
 
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Expert Comment

by:fcardinaux
ID: 24342537
Is $post a text where there can be any number of links ?

If not, if each $post only consists in one link, you can do this:

<?php
 

$posts = array(

    '[URL="http://google1.com"]google is a search engine[/URL]',

    '[URL=http://google2.com]google is a search engine[/URL]',

    '[URL=http://googleimg.com][IMG]http://google.com/logo.jpg[/IMG][/URL]');
 

foreach ($posts as $post) {

    

    if (false === stripos($post, '[img]')) {

        $post = preg_replace('/\[url="?([^\]"]+)[\]"].*/i', '$1', $post);

    }

    

    echo "$post<br>\n";

}

 

?>

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Accepted Solution

by:
fcardinaux earned 500 total points
ID: 24342626
In the other situation, you need to start by transforming the image links into a different, unmatchable pattern, then to replace the URLs, and finally to transform the image links back to their original pattern.
<?php
 

$post = <<<ENDOFPOST

Everybody knows that [URL="http://google.com"]google dot com[/URL] is a search engine, and 

that [URL=http://yahoo.com]yahoo dot com[/URL] is a search engine as well. Here is google's

logo: [URL=http://googleimg.com][IMG]http://google.com/logo.jpg[/IMG][/URL]. Enjoy!

ENDOFPOST;
 

$post = preg_replace('/\[url="?([^\]"]+)"?\]\[img\]([^\[]*)\[\/img\]\[\/url\]/i', '{~I~$1~M~$2~G~}', $post);

$post = preg_replace('/\[url="?([^\]"]+)"?\][^\[]*\[\/url\]/i', '$1', $post);

$post = preg_replace('/\{~I~([^~]*)~M~([^~]*)~G~\}/i', '[URL="$1"][IMG]$2[/IMG][/URL]', $post);

    

echo "$post<br>\n";
 

?>

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