import re
x="This is s u p e r and s.u.p.e.r and s👌u👌p👌e👌r and s!u.p!e.r"
pattern = r"(?<!\S)\w(?=(\W))(?:\1\w)+(?!\S)"
print([m.group() for m in re.finditer(pattern, x)])
aW1wb3J0IHJlCng9IlRoaXMgaXMgcyB1IHAgZSByIGFuZCBzLnUucC5lLnIgYW5kIHPwn5GMdfCfkYxw8J+RjGXwn5GMciBhbmQgcyF1LnAhZS5yIgpwYXR0ZXJuID0gciIoPzwhXFMpXHcoPz0oXFcpKSg/OlwxXHcpKyg/IVxTKSIKcHJpbnQoW20uZ3JvdXAoKSBmb3IgbSBpbiByZS5maW5kaXRlcihwYXR0ZXJuLCB4KV0p