Regex for basic block labels

[Peng_Yu]

Hi,

I see "bb:" in the .ll code processed by opt -S -instnamer. Is it defined here.

https://llvm.org/docs/LangRef.html#use-list-order-directives

What is the regex for all possible labels? Thanks.

[_Johannes_Doerfert]

I am not aware of any restrictions for the names.