Getting specific partition from the partition name

Hi ,
We are using postgres version 15.4. We have a range partition table and the
partition naming convention is generated by pg_partman and is something
like "table_name>_pYYYY_MM_DD".

We have a requirement of extracting specific partitions ordered by the date
criteria and also do some operations on that specific date. But I am
struggling and it's not working as expected.I tried something as below but
it's not working.Can somebody guide me here please.

to_date( substring('table_part_p2024_08_08' from
'_p(\d{4})_(\d{2})_(\d{2})'), 'YYYY_MM_DD'
) < current_date

or is there any ready-made data dictionary which will give us the order of
the partitions by the date and we can get hold of the specific nth
partition in that table?

Regards
Veem