AddOutputFilterByType SUBSTITUTE text/html Substitute "s!<(img.*?)class=\"float-(left|right)\"(.*?)>!<$1$3>!i" AddOutputFilterByType SUBSTITUTE text/html Substitute "s!(]*?)align=\"(left|right)\"([^>]*?)(class=\"f loat-(right|left)\")?([^>]*>)!$1$4align=\"$5\" class=\"float-$5\"$6$9!i"