Remove Title Attribute from Featured Image

If you have featured images (formerly post thumbnails) that aren’t named as well as they could be, it’s nice to remove the title attribute so that things like “header-large” don’t appear in the tool tips.

add_filter('post_thumbnail_html', 'remove_feat_img_title');
function remove_feat_img_title($img) {
    $img = preg_replace('/title="(.*?)"/','',$img);
    return $img; 
}