[Mailman-Users] Topics regex

[Tobey Wheelock]

I am having trouble getting my topics regex to handle replies to a topic.

The list identifier is [Rappnet]

Any of the following keywords are supposed to trigger the topic:
Loc:
Loc.
Local:
Local.
The keywords are supposed to precede the Subject, e.g. 
Subject: Loc: Test

This is my regex:
^(Re: \[Rappnet\] )?Loc(al)?[:.]

It catches the initial posts but not the replies.

Can anybody help?

Tobey Wheelock