Re: Another regexp performance improvement: skip useless paren-captures

[Mark Dilger]

> On Aug 9, 2021, at 7:20 PM, Tom Lane <t...@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 the patterns 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