[enh] #69: PubSec: Specify number of expected chars in the regex

- Imported from Silkaj
5 jobs for 71_handle_seedhex in 3 minutes and 20 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Github Sync
passed #16521
github
push_to_github

00:00:31

 
  Build
passed #16522
redshift-docker-python
build

00:00:45

 
  Test
passed #16524
redshift-docker-python
mypy

00:02:02

passed #16523
redshift-docker-python
test

00:00:47

 
  Release
manual #16525
redshift-docker-python allowed to fail manual
releases