<?php
$content = "<br />\n<br />";
$content = preg_replace('/<br \/>(?!.*<br \/>)/', '<br class="last" />', $content);
print $content;
?>
PD9waHAKJGNvbnRlbnQgPSAiPGJyIC8+XG48YnIgLz4iOwoKJGNvbnRlbnQgPSBwcmVnX3JlcGxhY2UoJy88YnIgXC8+KD8hLio8YnIgXC8+KS8nLCAnPGJyIGNsYXNzPSJsYXN0IiAvPicsICRjb250ZW50KTsKCnByaW50ICRjb250ZW50OwkKPz4=