Re: BUG #3645: regular expression back references seem broken

Tom Lane wrote:
> "Eric Haszlakiewicz" <erh+pgsql@swapsimple.com> writes:
>> I would expect this to return false:
>
>> template1=# select 'xyz' ~ E'^(.)\\1*$';
>>  ?column?
>> ----------
>>  t
>> (1 row)
>
> Seems to be a bug in the Tcl regexp library we use.  It's already
> reported upstream:
> https://sourceforge.net/tracker/index.php?func=detail&aid=1115587&group_id=10894&atid=110894
>
>             regards, tom lane

er.. it's been languishing there for over 2 years.  That doesn't sound
very promising for getting it fixed. :(

eric