Question regarding pathname expansion

[javajo91]

Morning - 

I'm reading "Learning the bash Shell" by Newham & Rosenblatt and have a
question regarding pathname expansion and wildcards.

They mention that wildcards can be used as part of a pathname.
The example they give is that if you wanted to list all the files in the
/usr & /usr2 directories you could simply type ls /usr*.

I understand this.

I'm having a problem however following the logic of this statement that says
that in order to list only the files that begin with a b&e in these same
directories you can type this:

ls /usr*/[be]*

If ls /usr* already lists all files in the /usr & /usr2 directories why do
you need a forward slash before the set containing b&e?


thank you for any assistance!
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