import re

strings = [
    "\".A.B.C.D.E.F.G.H.I.J\"",
    "\".K.Y.C.A.N.Y.W.H.I.A.W...1.B...1.1.7\"",
    "\"Testing using quotes func \"quot\".\"",
    "A.b.e.f. testing test"
]

for s in strings:
    print(re.sub(r"\.(?=\.?[A-Z0-9])", '', s))