Regexp SearchReplace

[sexy96]

What the pattern should look like?
zxy(a|ba|e|cdk) -> (zxya|zxyba|zxye|zxycdk)

SearchReplace:
what:???
with:???

or:
I have this pattern:
air(bag|frame|worthiness)

and I would like to receive:
(airbag|airframe|airworthiness)

or:
(aff|ch|disrep)air -> (affair|chair|disrepair)