View difference between Paste ID: nap0LewA and jKcBBAPk

 
 //attaches in-reply-to classes to the first link in the post
-  return preg_replace('`\<[aA] (.*?)>(.*?)\@(.*?)</[aA]>`','<a class="u-in-reply-to" rel="in-reply-to" $1>$2@$3</a>',$content,1);
+
 function the_content_in_reply_to_callback($matches){
 	if(preg_match('`href=.mailto`i',$matches[0])){
 		return $matches[0];
 	}else{
 		return '<a class="u-in-reply-to" rel="in-reply-to" '.$matches[1].'>'.$matches[2].'@'.$matches[3].'</a>';
 	}
 }
 function the_content_in_reply_to_filter($content) {
   return preg_replace_callback('`\<[aA] (.*?)>(.*?)\@(.*?)</[aA]>`','the_content_in_reply_to_callback',$content,1);
 }
 
 add_filter( 'the_content', 'the_content_in_reply_to_filter' );