DATABASE        USER            ADDRESS                 METHOD
host    all             all             localhost               trust

# The same using a regular expression for DATABASE, that allows connection
# to any databases with a name beginning with "db" and finishing with a
# number using two to four digits (like "db1234" or "db12").
#
# TYPE  DATABASE        USER            ADDRESS                 METHOD
host    "/^db\d{2,4}$"  all             localhost               trust

# Allow any user from any 