LFTP exclude file extensions

I am trying to mirror directories with lftp but I don't want to download filetypes that are notoriously large like .mp4 and .swf. But I am having trouble with the regex - and seeming like the exclude-glob too. Both of them download all files. What I tried: /usr/local/bin/lftp -u user,pass -e 'mirror -x ^(\.mp4|\.swf)$ $src $dest' ftp.host && /usr/local/bin/lftp -u user,pass -e 'mirror -X swf $src $dest' ftp.host