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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Mark Dilger <mark.dilger@enterprisedb.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Assert triggered during RE_compile_and_cache
Date: Sun, 08 Aug 2021 14:44:02 -0400
Message-ID: <3188079.1628448242@sss.pgh.pa.us> (raw)
In-Reply-To: <059A9825-0101-42B0-9E1C-0F71C2E13E96@enterprisedb.com>
References: <0203588E-E609-43AF-9F4F-902854231EE7@enterprisedb.com>
	<7F9BFA6F-9BC6-4A27-BFA1-2F01682BD644@enterprisedb.com>
	<2426993.1628201727@sss.pgh.pa.us>
	<29C525E6-A912-459F-BE27-217F25F76B5E@enterprisedb.com>
	<2437330.1628205382@sss.pgh.pa.us>
	<2442241.1628208783@sss.pgh.pa.us>
	<2822987.1628372679@sss.pgh.pa.us>
	<2860330.1628384606@sss.pgh.pa.us>
	<AB203EEC-6EB0-49BC-9585-736C40104895@enterprisedb.com>
	<3183669.1628443776@sss.pgh.pa.us>
	<A21126F3-4692-4040-8A18-805C5117C8C4@enterprisedb.com>
	<69308827-2F4E-426A-BE94-BD3EE11DFC1F@enterprisedb.com>
	<059A9825-0101-42B0-9E1C-0F71C2E13E96@enterprisedb.com>

Mark Dilger <mark.dilger@enterprisedb.com> writes:
> There are a few changes which appear correct to me, but I don't know if you expected them:

>  select regexp_match('hko', '((((?<!.))))(.(\3)(\1.))');
> - regexp_match 
> ---------------
> - 
> +    regexp_match    
> +--------------------
> + {"","","",hk,"",k}
>  (1 row)

Yes, this one is a consequence of 4aea704a5 (Fix semantics of regular
expression back-references).  The lookbehind constraint should not be
applied within the back-ref.

>  select 'nigqvigqvee' !~ '(())((\2)\2)(?:([^\W]))';
> -ERROR:  invalid regular expression: invalid escape \ sequence
> + ?column? 
> +----------
> + f
> +(1 row)
> +

and this one of 2a0af7fe4 (Allow complemented character class escapes
within regex brackets).

>  select regexp_replace('tl', '.{0}?(((?<![^][^]{1}?)))(.)\2{6}?', 'jx', 'mt');
>   regexp_replace
>  ----------------
> - tl
> + jxl
>  (1 row)

This looks like also a consequence of 4aea704a5.

			regards, tom lane





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  To: pgsql-hackers@postgresql.org
  Cc: tgl@sss.pgh.pa.us, mark.dilger@enterprisedb.com
  Subject: Re: Assert triggered during RE_compile_and_cache
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