Обсуждение: docs: Table 9.46. UUID Extraction Functions

On
   https://www.postgresql.org/docs/18/functions-uuid.html
there is:

Table 9.46. UUID Extraction Functions

which has these examples:

uuid_extract_version('41db1265-8bc1-4ab3-992f-​885799a4af1d'::uuid) → 4
uuid_extract_version('019535d9-3df7-79fb-b466-​fa907fa17f9e'::uuid) → 7

In my hands, copy/pasting from the website page html intto psql these 
don't work:

------
testdb=# select 
uuid_extract_version('41db1265-8bc1-4ab3-992f-​885799a4af1d'::uuid);
ERROR:  invalid input syntax for type uuid: 
"41db1265-8bc1-4ab3-992f-​885799a4af1d"
LINE 1: select uuid_extract_version('41db1265-8bc1-4ab3-992f-​885799...
------

Apparently, that's because of the dash characters used: if I re-type 
those with simple keyboard-minus chars, the statement works as expected.

If I copy/paste the result values of the previous table (9.45. UUID 
Generation Functions) into the uuid_extract_version() function, then the 
examples work so there the dash-characters are apparently ok.

Also, the copy/paste from the PDF text works without problem.

This formatting error, if that's what it is, occurs on docs of both 18 
and 19devel.

It's not a huge problem but it would be nice to fix the sgml so that it 
generates copy/paste runnable examples here.

Thanks,


Erik Rijkers

> On 4 Sep 2025, at 11:54, Erik Rijkers <er@xs4all.nl> wrote:

> In my hands, copy/pasting from the website page html intto psql these don't work:
>
> ------
> testdb=# select uuid_extract_version('41db1265-8bc1-4ab3-992f-​885799a4af1d'::uuid);
> ERROR:  invalid input syntax for type uuid: "41db1265-8bc1-4ab3-992f-​885799a4af1d"
> LINE 1: select uuid_extract_version('41db1265-8bc1-4ab3-992f-​885799...
> ------
>
> Apparently, that's because of the dash characters used: if I re-type those with simple keyboard-minus chars, the
statementworks as expected. 

I believe it is because there is a &zwsp; encoded before the last group, which
was added in a6524105d20b in order to aid line breaking.

> If I copy/paste the result values of the previous table (9.45. UUID Generation Functions) into the
uuid_extract_version()function, then the examples work so there the dash-characters are apparently ok. 

There is no zero-width-space character there since those lines aren't long
enough to cause line breaks.

> It's not a huge problem but it would be nice to fix the sgml so that it generates copy/paste runnable examples here.

Agreed, it would be a nice to have, but not a showstopper.

--
Daniel Gustafsson