[Serusers] serrweb regex problem

Hello to all I installed the last serweb, but I had one problem registering users. When the users receive the confirmation email, they have to go to the confirmation link, and this confirmation link does this select in the DB:

select max(abs(username)) from aliases where domain='mydomain.pt' and username REGEXP "[0-9]+$";

ERROR: syntax error at or near "REGEXP" at character 79 LINE 1: ...om aliases where domain='mydomain.pt' and username REGEXP "[0...

^

(the ^ is under REGEXP)

I m using PostgreSQL 8.0.0, and I believe the problem is with the postgres support of REGEXP... I googled and googled and I didnt found a solution yet. Did anyone had this problem too? Thanks Joao Pereira