Cob not so much, the other two pop up frequently.
I had this problem a few years back, I moved from Lancashire after a considerable amount of years living there, to Yorkshire, had no freakin' idea what people were saying to me (beyond the scope of common words).
It's definitely regional.
EDIT: They make Lancashire to Yorkshire, dictionaries too.
It's also worse when they make up their own slang, for example Cockney.