Looking at the regex it seems that . (dot) is also allowed. Is that right? If so, the error message should be altered accordingly.

I can confirm that after adding the aforementioned code block to my scripts everything works as expected.

I'll take a look at the guidelines to contribute, thank you!

Thank you for the clarification, I will edit my scripts accordingly. I was under the impression that VRRP transition scripts are called with the vyattacfg group out of the box, since there is an example in the documentation which has the sg part missing: https://docs.vyos.io/en/latest/automation/command-scripting.html#run-configuration-commands