Economist
Hi Bigoyal,
First of all thanks a lot for such a nice explanation. This will really help others.
However, I was wondering if we are talking about a situation here...
"except in the domains of ..." , we are talking about 'domains' which is a noun/thing...
"except for the domains of A and B "..also looks okay to me...(going by the idiomatic use)...
May be I am wrong...can you pls explain?
PS: I am just playing devil's advocate to make stuff more clear

Agree, with you. Thanks for tempting me to find more on this. Here are some more of my findings on
Except:
1.
Acting as conjunction Usage: 'Except' before prepositions and conjunctions (DO NOT use idiom 'Except for' in this case)
Meaning: with the exception
E.g.
We've been in the all the towns except in Shropshire.
They didn't open their mouths except to complain.
They are happy all the time except when they have to take tests.
I would go except that it's too far.Here, preposition or conjunction would be determined based on the sentence itself.
2.
acting as Preposition:
e.g.
Everyone except me3.
Idiom 'Except for'Meaning: Other than, were it not for
e.g.
Except for Jack, everyone came to the party4.
Acting as verbe.g.
Children are excepted from the entry ticketSuggestions / concerns are welcome