| From: | Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Assert triggered during RE_compile_and_cache |
| Date: | 2021-08-05 22:22:57 |
| Message-ID: | 29C525E6-A912-459F-BE27-217F25F76B5E@enterprisedb.com |
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| Lists: | pgsql-hackers |
> On Aug 5, 2021, at 3:15 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> I don't immediately see what's different about your failing case
> versus the not-failing ones.
I have now found lots of cases of this failure. I *believe* the backreference is always greater than 1, and it is always in a capture group which then has the {0} or {0,0} applied to it.
You can find lots of cases using the attached regex generating script I whipped up for testing your work. (Note this is just a quick and dirty tool for hacking, not anything refined.)
| Attachment | Content-Type | Size |
|---|---|---|
| backref.pl | text/x-perl-script | 4.0 KB |
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