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What I'm trying to do is replace message_tags to links and web addresses to links in facebook json data, the problem is I need to do these in 2 steps, first do the message tags then then web addresses. The message_tags need to be done first because they rely on offset and length of the message to do the replace. To code to first replace the message_tags is // convert message tags to links if($post->message_tags) { usort($post->message_tags, 'mySort'); foreach($post->message_tags as $message_tag) { foreach($message_tag as $link) { $post_text = substr_replace($post_text,"<a href=\"https://www.facebook.com/".$link->id."\" target=\"_blank\">".$link->name."</a>",$link->offset,$link->length); } } } The second part is to convert any web address (http://example.com) to a link (<a href ="http://example.com" title="http://example.com" target="_blank">http://example.com</a>) // check if any entites exist and if so, replace them with hyperlinked versions $post_text = preg_replace("/((http:\/\/|https:\/\/)[^ )]+)/e", "'<a href=\"$1\" title=\"$1\" target=\"_blank\">'. ((strlen('$1')>=250 ? substr('$1',0,250).'...':'$1')).'</a>'", $post_text); So now to the problem, the second part now rewrites the first part and completely destroys the link because it just looks for http: and https: so in my preg_replace I need a way to not include anything that has already been converted, so not include anything that already has href="http