nested expr in a mapping

Hi,

Is it posible to nest conditionals in a mapping, something like, just for demonstration:

vnoremap <expr> vv (strlen(@y) == 1) ? ':let ...' : '("vcl" =~ getregtype("*")) ? 'some foo' : 'some bar' ' <bar> some more ...

Can we do this ?  Do I use ''' (3 single quotes) to embed quotes ?  (and then 5 for a 2nd level embed ...) ... ?

thx as always,

-m

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