From: Bruce Momjian <bruce@momjian.us>
To: f2381430@mvrht.com
To: pgsql-docs@lists.postgresql.org
Subject: Re: Undocumented behaviour of \s in SIMILAR TO expression
Date: Tue, 22 Jan 2019 19:55:15 -0500
Message-ID: <20190123005515.GC1493@momjian.us> (raw)
In-Reply-To: <154470529073.5057.10757027183683688588@wrigleys.postgresql.org>
References: <154470529073.5057.10757027183683688588@wrigleys.postgresql.org>
On Thu, Dec 13, 2018 at 12:48:10PM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/11/functions-matching.html
> Description:
>
> SELECT ' ' SIMILAR TO '[\s]';
> returns true
>
> SELECT ' ' SIMILAR TO '[\q]';
> generates an error: [2201B]: ERROR: invalid regular expression: invalid
> escape \ sequence
>
> \s is not mentioned in the SIMILAR TO section
> (https://www.postgresql.org/docs/current/functions-matching.html#FUNCTIONS-SIMILARTO-REGEXP).
> If it’s officially supported (which would be useful for my current task), it
> should be documented. Otherwise the server should generate an error like for
> other invalid escapes.
Well in:
https://www.postgresql.org/docs/11/functions-matching.html
I see \s documented, but not \q:
Table 9.19. Regular Expression Class-shorthand Escapes
Escape Description
\d [[:digit:]]
\s [[:space:]]
\w [[:alnum:]_] (note underscore is included)
\D [^[:digit:]]
\S [^[:space:]]
\W [^[:alnum:]_] (note underscore is included)
Frankly, I can't even guess what you expect \q to do.
--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-docs@postgresql.org
Cc: bruce@momjian.us, f2381430@mvrht.com, pgsql-docs@lists.postgresql.org
Subject: Re: Undocumented behaviour of \s in SIMILAR TO expression
In-Reply-To: <20190123005515.GC1493@momjian.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox