posting.php
and find:$post_data['post_subject'] = ((strpos($post_data['post_subject'], '[b]Re:[/b] ') !== 0) ? '[b]Re:[/b] ' : '') . censor_text($post_data['post_subject']);
viewtopic.php
, find:'SUBJECT' => '[b]Re:[/b] ' . censor_text($topic_data['topic_title']),