Channel names are UTF-8 compatible and can be up to 92 characters in length. 


IMPORTANT: The period/dot character is not actually invalid but it is reserved for wildcard features so it is best to avoid using it in channel names unless you are intentionally for wildcard pattern usage or associated with Function binding.


The only characters that are not valid for creating channel names are:

comma,
colon:
astrick*
slash/
backslash\
space 
Unicode zero  
non-printable ASCII control characters  


It is important to note that some of the above characters may work in some APIs in some SDKs, but could cause others to fail, so it is recommended that you avoid these characters regardless of the API you are working with.