Skip site navigation (1) Skip section navigation (2)

WIP: proof of concept patch for fixing quantified regex backrefs

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-hackers(at)postgreSQL(dot)org
Subject: WIP: proof of concept patch for fixing quantified regex backrefs
Date: 2012-02-22 16:19:13
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Attached is as far as I've gotten with fixing depesz's complaint about
backrefs embedded within larger quantified expressions (the complaint
being that only the last match of the backref is checked properly).
This is per the analysis I posted at
to the effect that the engine really has to have an "iteration" subre

The patch is incomplete because I have not written the code yet for the
shortest-match-first case, only longest-match-first.  Within that
restriction, it seems to work, though I have not yet tried the Tcl
regression tests on it.

I have to set this aside now and go focus on release tasks (like writing
release notes), so it's not going to be done in time to include in the
upcoming back-branch releases.  I have mixed feelings about whether to
treat it as a back-patchable bug fix when it's done ... it's certainly a
bug fix but the odds of introducing new issues seem higher than average.
So maybe it should only go into HEAD anyway.  Thoughts?

			regards, tom lane

Attachment: quantified-regex-fix-1.patch
Description: text/x-patch (26.2 KB)


pgsql-hackers by date

Next:From: Andrew DunstanDate: 2012-02-22 16:26:34
Subject: Re: leakproof
Previous:From: Kevin GrittnerDate: 2012-02-22 16:14:34
Subject: Re: leakproof

Privacy Policy | About PostgreSQL
Copyright © 1996-2018 The PostgreSQL Global Development Group