CODEWITHSUNDEEP
phpregexpreg-replace
Glad To Help
Glad To Help

Reputation: 5387

PHP Regular expression to disallow too short urls

I have a regular expression that finds urls in text and replaces them with links

preg_replace( '@(?<![.*">])\b(?:(?:https?|ftp|file)://|[a-z]\.)[-A-Z0-9+&#/%=~_|$?!:,.]*[A-Z0-9+&#/%=~_|$]@i', '<a href="\0" target="_blank" rel="nofollow">\0</a>', $text );

The problem is, when someone types text that contains "i.e" it converts it also to a link, which should not happen. How do I limit this regular expression to replace strings longer than 3 characters?

I tried putting {3,}, but it's not working.

preg_replace( '@(?<![.*">])\b(?:(?:https?|ftp|file)://|[a-z]\.)
([-A-Z0-9+&#/%=~_|$?!:,.]{3,})*[A-Z0-9+&#/%=~_|$]@i', '
<a href="\0" target="_blank" rel="nofollow">\0</a>', $text );

Upvotes: 1

Views: 107

Answers (1)

artragis
artragis

Reputation: 3713

you can use preg_replace_callback to check if the text captured has at least 5 or 6 chars :

preg_replace_callback( '@(?<![.*">])\b(?:(?:https?|ftp|file)://|[a-z]\.)([-A-Z0-9+&#/%=~_|$?!:,.]{3,})*[A-Z0-9+&#/%=~_|$]@i', function($matches){
   if(strlen($matches[0])>5){
      return '<a href="'.$matches[0].'" target="_blank" rel="nofollow">'.$matches[0].'</a>';
    }else{
       return $matches[0];
     }
   }, $text );

Upvotes: 2

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