From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: zoulx1982@163.com
Subject: BUG #19104: Does regexp_substr function support non-greedy matching?
Date: Wed, 05 Nov 2025 12:41:30 +0000
Message-ID: <19104-c9e08a2693264d98@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 19104
Logged by: lx zou
Email address: zoulx1982@163.com
PostgreSQL version: 18.0
Operating system: Linux
Description:
When i use regexp_substr to process some text file, i found regexp_substr
does not support non-greedy match.
But fix the case again, i found maybe it support non-greedy, i don't hear
why the two cases get different results? or is it a regexp_substr bug ?
following is the test case:
ostgres=# SELECT regexp_substr('d.cook', '[a-z]+\.[a-z]{2,}?');
regexp_substr
---------------
d.cook
(1 row)
postgres=# SELECT regexp_substr('d.cook', '[a-z]\.[a-z]{2,}?');
regexp_substr
---------------
d.co
(1 row)
postgres=# select version();
version
--------------------------------------------------------------------------------
PostgreSQL 19devel on x86_64-pc-linux-gnu, compiled by gcc (GCC) 9.1.0,
64-bit
(1 row)
postgres=#
Thanks for your reading.
Regards.
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Subject: Re: BUG #19104: Does regexp_substr function support non-greedy matching?
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