I don't have an OS X box, but I do know that you'll need to change the `-r` to `-E` (GNU sed vs BSD sed). Recent versions of GNU sed (4.2+, I think) also accep

I don't have an OS X box, but I do know that you'll need to change the `-r` to `-E` (GNU sed vs BSD sed). Recent versions of GNU sed (4.2+, I think) also accept `-E` for compatibility with BSD sed (though this is undocumented).