enforce naming convention - Mailing list pgsql-general

Hi,
is it possible to enforce naming convention in pg?

Can I create a trigger that runs when a new object is created and see
if its name is in an expected format and if not reject it?

I had to create a new schema 'zref' storing some of our tables to
conceptually separate them but I want to make sure that when we create
new tables we can't have the same table name in 'zref' and 'public'.

Thanks for the help.
Balázs