Re: [PATCH] regexp_positions ( string text, pattern text, flags text ) → setof int4range[]

From: Daniel Gustafsson <daniel(at)yesql(dot)se>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Joel Jacobson <joel(at)compiler(dot)org>, Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com>, Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Andreas Karlsson <andreas(at)proxel(dot)se>, David Fetter <david(at)fetter(dot)org>, Gilles Darold <gilles(at)darold(dot)net>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Subject: Re: [PATCH] regexp_positions ( string text, pattern text, flags text ) → setof int4range[]
Date: 2021-09-01 22:03:58
Message-ID: E4851E05-A9C9-4B5F-B809-8E020DE527F6@yesql.se
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> On 1 Sep 2021, at 16:02, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> Daniel Gustafsson <daniel(at)yesql(dot)se> writes:
>>> On 9 Mar 2021, at 20:30, Joel Jacobson <joel(at)compiler(dot)org> wrote:
>>> Attached is a patch implementing it this way.
>
>> This patch no longer applies, can you please submit a rebased version?

On a brief skim, this patch includes the doc stanza for regexp_replace which I
assume is a copy/pasteo.

+ TupleDescInitEntry(tupdesc, (AttrNumber) 1, "starts”,
While “start_positions” is awfully verbose, just “starts” doesn’t really roll
off the tongue. Perhaps “positions” would be more explanatory?

> Also, since 642433707 ("This patch adds new functions regexp_count(),
> regexp_instr(), regexp_like(), and regexp_substr(), and extends
> regexp_replace() with some new optional arguments") is already in,
> we need to think about how this interacts with that. Do we even
> still need any more functionality in this area? Should we try to
> align the APIs?

I can see value in a function like this one, and the API is AFAICT fairly
aligned with what I as a user would expect it to be given what we already have.

--
Daniel Gustafsson https://vmware.com/

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