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Page: https://www.postgresql.org/docs/12/sql-createsubscription.html
Description:

Hi, i'm using v10 and
Create publication "PubAll  Master(192.168.1.180) Slave(192.168.1.185)"
....
Works fine, but
Create publication "suball  master(192.168.1.180) slave(192.168.1.185)"
....

I get the naming error (Replication slot names may only contain lower case
letters, numbers, and underscore character.

Don't  know about other versions but 
Thought to imply to this matter, thanks.

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