import re
pattern = r'(?<!\d)\d{1,2}([.:/ -])(?:\d{1,2}|\w{3,})\1\d{4}(?!\d)'
text = 'Aaaa 12-23-2019, bddd 29 10 2019 <=== 1:2:2018'
results = [x.group() for x in re.finditer(pattern, text)]
print(results)
aW1wb3J0IHJlCnBhdHRlcm4gPSByJyg/PCFcZClcZHsxLDJ9KFsuOi8gLV0pKD86XGR7MSwyfXxcd3szLH0pXDFcZHs0fSg/IVxkKScKdGV4dCA9ICdBYWFhIDEyLTIzLTIwMTksIGJkZGQgICAyOSAxMCAyMDE5IDw9PT0gICAxOjI6MjAxOCcKcmVzdWx0cyA9IFt4Lmdyb3VwKCkgZm9yIHggaW4gcmUuZmluZGl0ZXIocGF0dGVybiwgdGV4dCldCnByaW50KHJlc3VsdHMp