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Re: Another regexp performance improvement: skip useless paren-captures - Mailing list pgsql-hackers

From Mark Dilger
Subject Re: Another regexp performance improvement: skip useless paren-captures
Date
Msg-id 51ED454F-0F52-4D66-8117-1DB0363240DF@enterprisedb.com
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In response to Re: Another regexp performance improvement: skip useless paren-captures  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Another regexp performance improvement: skip useless paren-captures  (Tom Lane <tgl@sss.pgh.pa.us>)
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> On Aug 9, 2021, at 7:20 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> So I took another look at the code, and it doesn't seem that hard
> to make it act this way.  The attached passes regression, but
> I've not beat on it with random strings.
> alternate-fix-zero-quantified-nested-parens.patch

I've beaten on this with random patterns and it seems to hold up just fine.  I have also reviewed the diffs and, for
thepatterns where the output changes, everything looks correct.  I can't find anything wrong with this patch. 

—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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