pg7.0.2 doesnt yield match on regexps w/ many "|"

Emils Klotins (emils(at)grafton(dot)lv) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
pg7.0.2 doesnt yield match on regexps w/ many "|"

Long Description
Adding more than a very limited number of complexness to a regexp query will yield 0 rows without any error message.

The example code below shows a very small table and a regexp with multiple choices: '(word|word|word)'

as soon as another word is addded '(word|word|word|word)', OR the query changed to, for example, '(word|word|word) *', it returns 0 rows, although it should return the same (8 rows).

My environment: RedHat Linux 6.2 on Alpha DS10, gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

Sample Code
CREATE TABLE "test" (
"title" text
);
COPY "test" FROM stdin;
Serious Sam ce pie pircjiem
Black & White gaidanas svtki
Lorgaine: The Black Standard - eltu varoeposs
Lorgaine: The Black Standard beta versija
Black&White tomr neesot spiegu programma
Black & White FAQ
Black & White "aunais" FAQ
Black & White - prdotk sple ASV
\.

SELECT title FROM test WHERE title ~* '(BLACK|WHITE|SERIOUS|SAM)' ;
....
(8 rows)

SELECT title FROM test WHERE title ~* '(BLACK|WHITE|SERIOUS|blah|SAM)' ;
title
-------
(0 rows)

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