The problem you're having is that a wildcard in the path specification of a monitor: stanza is implemented on the backend of a monitor: of the longest fixed path, and a whitelist = * regex to match the specific entries according to the original monitor: stanza. This means that the monitor stanza for "/pack/jboss/server/staging_xxx/log/server.log" is a descendent of the (implicit) rule: "/pack/jboss/server" (with whitelist...). If the list of edu_ subdirs is not large, you could iterate each.
You could also try this. Explicitly monitor the top-level directory, and include a whitelist to match the subpaths.
[monitor:///pack/jboss/server]
whitelist = (edu_.*|staging_xxx)/log/server.log
sourcetype = server_log
OMIT the sourcetype, but add a props.conf to include a source-based rule:
[source::///pack/jboss/server/staging_xxx/log/server.log]
index = foo
[source::///pack/jboss/server/edu_.*/log/server.log]
index = bar
(I haven't tested this particular example, but I've done things like this in the past.)
