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preg_replace URL's

Posted on 2006-06-07
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Last Modified: 2008-03-10
I found this code on php.net which replaces links so that they open in a new window. I need to change it slightly so that text links do as below, but image links have rel="lightbox" inserted in the <a> tag.

Any help would be greatly appreciated!

function make_links_blank($text)
{
  return  preg_replace(
     array(
       '/(?(?=<a[^>]*>.+<\/a>)
             (?:<a[^>]*>.+<\/a>)
             |
             ([^="\']?)((?:https?|ftp|bf2|):\/\/[^<> \n\r]+)
         )/iex',
       '/<a([^>]*)target="?[^"\']+"?/i',
       '/<a([^>]+)>/i',
       '/(^|\s)(www.[^<> \n\r]+)/iex',
       '/(([_A-Za-z0-9-]+)(\\.[_A-Za-z0-9-]+)*@([A-Za-z0-9-]+)
       (\\.[A-Za-z0-9-]+)*)/iex'
       ),
     array(
       "stripslashes((strlen('\\2')>0?'\\1<a href=\"\\2\">\\2</a>\\3':'\\0'))",
       '<a\\1',
       '<a\\1 target="_blank">',
       "stripslashes((strlen('\\2')>0?'\\1<a href=\"http://\\2\">\\2</a>\\3':'\\0'))",
       "stripslashes((strlen('\\2')>0?'<a href=\"mailto:\\0\">\\0</a>':'\\0'))"
       ),
       $text
   );
}
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Question by:spikeyjames
  • 2
3 Comments
 
LVL 49

Accepted Solution

by:
Roonaan earned 500 total points
ID: 16859267
Try this addition:

function make_links_blank($text)
{
  return  preg_replace(
     array(
       '/(?(?=<a[^>]*>.+<\/a>)
             (?:<a[^>]*>.+<\/a>)
             |
             ([^="\']?)((?:https?|ftp|bf2|):\/\/[^<> \n\r]+)
         )/iex',
       '/<a([^>]*)target="?[^"\']+"?/i',
       '/<a([^>]+)>/i',
       '/(^|\s)(www.[^<> \n\r]+)/iex',
       '/(([_A-Za-z0-9-]+)(\\.[_A-Za-z0-9-]+)*@([A-Za-z0-9-]+)
       (\\.[A-Za-z0-9-]+)*)/iex',
       '/<a([^>]+)><img/iex'
       ),
     array(
       "stripslashes((strlen('\\2')>0?'\\1<a href=\"\\2\">\\2</a>\\3':'\\0'))",
       '<a\\1',
       '<a\\1 target="_blank">',
       "stripslashes((strlen('\\2')>0?'\\1<a href=\"http://\\2\">\\2</a>\\3':'\\0'))",
       "stripslashes((strlen('\\2')>0?'<a href=\"mailto:\\0\">\\0</a>':'\\0'))",
       "stripslashes((strstr('\\1', 'rel=\"lightbox\"') ? '\\0' : '<a\\1 rel=\"lightbox\"><img'))"
       ),
       $text
   );
}

-r-
0
 
LVL 1

Author Comment

by:spikeyjames
ID: 16859597
Thanks, that seems to have done the job!

I'd like to learn the intracacies of preg_replace but can't find any good sites. Do you know of any that explain what the symbols all mean and how they work?
0
 
LVL 49

Expert Comment

by:Roonaan
ID: 16859609
You can find a lot of info on http://www.regular-expressions.info/
On that site you will not only find regular expression for php specific, but also more general information, and tutorials on implementing in other languages as well.

-r-
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