parentheses and angle brackets

Era Eriksson suggested to Vincent Gillet,

|     :0    # I bet you really mean <(commercial)> here, not \<(commercial)\>
|     * ^Subject: \[.*CDI.* .*([0-9][9-9]|FR|RO).*\].*\<(commercial)\>
|     { FWD="$FWD user1(_at_)magic(_dot_)fr" }

Parentheses around a simple text string with no *, ?, or + following don't
make sense either.  Perhaps Vincent meant something involving literal paren-
theses and should have used \(commercial\); whether the angle brackets are
supposed to be literal or not, I cannot guess.