BUG #3788: POSIX regexp seems doesn't work for '(?!re) ' pattern

The following bug has been logged online:

Bug reference: 3788
Logged by: Vitaly
Email address: vitaly.yakunin@gmail.com
PostgreSQL version: 8.3-beta3
Operating system: WinXP
Description: POSIX regexp seems doesn't work for '(?!re) ' pattern
Details:

SELECT author, type
FROM books WHERE "type" ~ '(?!novel)';

This select work incorrect. It returns all types.

Work around:
SELECT author, type
FROM books WHERE not ("type" ~ '(?=novel)');