Channel names can contain any unicode character with the following exceptions:
- They cannot start with a square bracket [
Square brackets are reserved as a means to provide metadata or instructions to Ably about the intended channel when subscribing.
- They cannot start with a colon :
Colons are used to delimit channel namespaces. Find out more about channel namespaces
- They cannot contain any newline characters (or similar, e.g. carriage return or unicode page separator)
- They cannot be empty