Spaces in mutt patterns

[barnabas@knicknack.net]

I know I could ask this question on a mutt list, but since there are
quite a few mutt users here, I thought I'd ask here first.

Nightly I send myself several status report and I'd like to set up
save-hooks based on the subject of the message.  The problem I'm
having is with spaces in the pattern.  Everything I've tried thus far
either produces a syntax error in the .muttrc or a "too many
arguments" error.

What I want is something like the following:

save-hook ~sNightly Backup Report +backup

Can anyone help me with the proper syntax?

Thanks.

Eric