[jQuery] selecting all element with a given class but not another one.

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Hi,

I can't figure out what the syntax is to select all the elements which
have a given class but not another given class.
Example : I want all the elements with class .RepeatedItem but which
don't have the class .RepeatedItemSelected.

I've tried this with no luck :

$(".RepeatedItem + not:(.RepeatedItemSelected)")

Does anyone know the syntax ?
Thanks