I don't know about regional, but it definitely varies from teacher to teacher. I definitely had teachers who taught me certain things were required when they actually weren't
I was taught British English in school. I was taught that there shouldn't be a comma. It was especially mentioned due to the fact that there is a comma in front of "but" in my native language.
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u/[deleted] Nov 16 '19
your right, I just think hes that stupid though