(?<!...) not accepted as regular expression

[Panagiotis Issaris]

When searching for a way to reject the mailinglist address as a sender (as we're getting lots of spam that way), I was looking at http://docs.python.org/library/re.html as suggested by the Mailman Admin GUI.

The expression I was trying to use based on "(?<!...)", was unfortunately not accepted.

I added "^(?<!listname@konijn\.)somesite.be$" to the accept_these_nonmembers list
and got "Error: Invalid value for variable: accept_these_nonmembers" as a result.

[Mark Sapiro (msapiro)]

What mailman version is this?

I tried the exact regexp "^(?<!listname@konijn\.)somesite.be$" without the quotes in accept_these_nonmembers in Mailman 2.1.12, and it was accepted.