From: | Alvaro Herrera Munoz <alvherre(at)dcc(dot)uchile(dot)cl> |
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To: | David Fetter <david(at)fetter(dot)org> |
Cc: | PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: WITH clause |
Date: | 2003-12-12 19:07:54 |
Message-ID: | 20031212190754.GA11548@dcc.uchile.cl |
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Thread: | |
Lists: | pgsql-hackers |
On Fri, Dec 12, 2003 at 10:13:56AM -0800, David Fetter wrote:
> I'm looking to the SQL WITH clause as a way to get better regex
> support in PostgreSQL. I've been chatting a little bit about this,
> and here's an idea for a behavior. Implementation details TBD.
I think you could be rather looking at keeping the regmatch_t * from
RE_compile_and_execute somewhere in the TopTransactionContext, and
create accessor functions to it. You could do
BEGIN;
SELECT ... x ~ '([0-9]+)x([0-9]+)';
SELECT regex_parens(1), regex_parens(2);
COMMIT;
Etc, you get the idea. Of course you could only access the captured
expressions from the last regex, and only within the same transaction
block.
--
Alvaro Herrera (<alvherre[(at)]dcc(dot)uchile(dot)cl>)
Maybe there's lots of data loss but the records of data loss are also lost.
(Lincoln Yeoh)
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