Re: BUG #8679: Error in regex function

spmpro@pochta.ru writes:
> May be, regex construction (?<=\pattern\) is not support?

It is not.  What we support is documented at
http://www.postgresql.org/docs/9.2/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP

I have no idea what "(?<=" is supposed to mean --- it's not a standard
regexp construct, for sure.  In general, "(?" is used to introduce
non-POSIX extensions that are specific to particular regexp
implementations.  There's some commonality there, but you should never
assume that such things are portable.

            regards, tom lane