From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alexey Shishkin <alexey.shishkin.01@gmail.com>
cc: "David G. Johnston" <david.g.johnston@gmail.com>,
        "pgsql-bugs@lists.postgresql.org" <pgsql-bugs@lists.postgresql.org>
Subject: Re: pg_ident.conf + regular expressions issue
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Comments: In-reply-to Alexey Shishkin <alexey.shishkin.01@gmail.com>
	message dated "Mon, 21 Oct 2024 22:58:12 +0200"
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Date: Mon, 21 Oct 2024 17:04:48 -0400
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Alexey Shishkin <alexey.shishkin.01@gmail.com> writes:
> OK, what we have is:
> "(?c)^(.*SMOKEYBEAR)$" does not match "smokeybear"
> and at the same time:
> "(?i)^(.*SMOKEYBEAR)$" does match "smokeybear"
> How the latter is possible ?

Uh, that's the entire point of the "i" flag, no?
See about embedded options here:

https://www.postgresql.org/docs/current/functions-matching.html#POSIX-META=
SYNTAX

			regards, tom lane