uninterruptable regexp_replace in 9.2 and 9.3

Starting with commit 173e29aa5 the regexp_replace function
became uninterruptable during operations, and takes a lot
of time and RAM to process some patterns.

Full story in this thread:
http://www.postgresql.org/message-id/646.1393031856@sss.pgh.pa.us

I'm hoping a mail to pgsql-bugs would assign this issue a ticket
number for me to follow. Let me know if there's a better way.
Thank you !

--strk;

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