Sieve notify variables not working with body?

Hi,

I want to send notification like this:

if body :text :matches "*" { notify :importance "3" :message "[NOTIFY] ${1}" "mailto:test@example,com"; }

The notification works but the variable ${1} seems to be empty.

But in this case:

if header :matches "Subject" "*" { notify :importance "3" :message "[NOTIFY] ${1}" "mailto:test@example,com"; }

Everything works correct.

Regards, Bambero