note 46739 modified in function.preg-replace by aidan
| From: | aidan@php.net | Date: | Thu, 04 Nov 2004 05:03:48 +0000 |
| Subject: | note 46739 modified in function.preg-replace by aidan | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-79580@lists.php.net to get a copy of this message | ||
I needed to treat exclusively long urls and not shorter ones for which my client prefered to have
their complete addresses displayed. Here's the function I end up with:
<?php
function auto_url($txt){
# (1) catch those with url larger than 71 characters
$pat = '/(http|ftp)+(?:s)?:(\\/\\/)'
.'((\\w|\\.)+)(\\/)?(\\S){71,}/i';
$txt = preg_replace($pat, "<a href=\"\\0\"
target=\"_blank\">$1$2$3/...</a>",
$txt);
# (2) replace the other short urls provided that they are not contained inside an html tag
already.
$pat = '/(?<!href=\")(http|ftp)+(s)?:' .
.'(\\/\\/)((\\w|\\.)+) (\\/)?(\\S)/i';
$txt = preg_replace($pat,"<a href=\"$0\"
target=\"_blank\">$0</a> ",
$txt);
return $txt;
}
?>
Note the negative look behind expression added in the second instance for exempting those that are
preceded with ' href=" ' (meaning that they were already put inside appropiate html
tags by the previous expression)
(get rid of the space between question mark and the last parenthesis group in both regex, I need to
put it like that to be able to post this comment)
--was--
I needed to treat exclusively long urls and not shorter ones for which my client prefered to have
their complete addresses displayed. Here's the function I end up with:
<?php
function auto_url($txt){
# (1) catch those with url larger than 71 characters
$txt = preg_replace("/(http|ftp)+(?:s)?:(\\/\\/)((\\w|\\.)+)(\\/)? (\\S){71,}/i",
"<a href=\"\\0\" target=\"_blank\">$1$2$3/...</a>",
$txt );
# (2) replace the other short urls provided that they are not contained inside an html tag already.
$txt = preg_replace( "/(?<!href=\")(http|ftp)+(s)?:(\\/\\/)((\\w|\\.)+)
(\\/)?(\\S)/i","<a href=\"$0\" target=\"_blank\">$0</a>
",
$txt );
return $txt;
}
?>
Note the negative look behind expression added in the second instance for exempting those that are
preceded with ' href=" ' (meaning that they were already put inside appropiate html
tags by the previous expression)
(get rid of the space between question mark and the last parenthesis group in both regex, I need to
put it like that to be able to post this comment)
http://php.net/manual/en/function.preg-replace.php