Corey Csuhta <its+postgres(at)csuhta(dot)com> writes:
> I don’t know if this is related or a separate bug, but I am also having this problem with the `+` operator and character classes. Very similar test case:
> CREATE TABLE foobar (x text);
> INSERT INTO foobar VALUES ('Trying +1/+1'),('Also doing +20/+20');
> CREATE EXTENSION pg_trgm;
> CREATE INDEX ON foobar USING gin (x gin_trgm_ops);
> SET enable_seqscan TO on;
> SELECT * FROM foobar WHERE x ~ '\+\d+\/\+\d+'; -- Returns both rows
> SET enable_seqscan TO off;
> SELECT * FROM foobar WHERE x ~ '\+\d+\/\+\d+'; -- Returns 0 rows
Hmm ... seems unrelated, since there's no lookahead constraint in this
example. Also, the patch I committed earlier today doesn't fix it.
regards, tom lane