Alban Hertroys <haram...@gmail.com> writes:
> On 4 Feb 2012, at 9:46, hubert depesz lubaczewski wrote:
>> select 'depesz depeszx depesz' ~ E'^(.*)( \\1)+$';

> Apparently something odd is going on between the wildcard, the repetitive 
> part and the back-reference. That could be just us not seeing what's wrong 
> with the expression or be an actual bug.

FYI, I've made some progress on characterizing the cause of this bug,
as per comments at the upstream bug report:
https://sourceforge.net/tracker/index.php?func=detail&aid=1115587&group_id=10894&atid=110894
There are actually two distinct bugs involved, and I don't yet have a
patch for the case depesz illustrates.

                        regards, tom lane

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