BUG #3037: strange behave of CHECK constraint

The following bug has been logged online:

Bug reference:      3037
Logged by:          Pavel Stehule
Email address:      pavel.stehule@hotmail.com
PostgreSQL version: 8.3
Operating system:   Linux
Description:        strange behave of CHECK constraint
Details:

check constraint is incorect for operator SIMILAR

root=# create table products(
  barcode char(13) NOT NULL
  check (barcode NOT similar to '%[^0-9]%')
);

root=# insert into products values('22');
ERROR:  new row for relation "products" violates check constraint
"products_barcode_check"
root=# insert into products values('aa');
ERROR:  new row for relation "products" violates check constraint
"products_barcode_check"

root=# select '22'  NOT similar to '%[^0-9]%';
 ?column?
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 t
(1 řádka)