import re
rx = r"\d{1,31}(?::? |[-/])\d{1,12}(?::? |[-/])\d{4}"
s = "My name is ALi Date is 09/03/2018"
m = re.search(rx, s)
if m:
print("{} : DATESTR".format(m.group()))
aW1wb3J0IHJlCnJ4ID0gciJcZHsxLDMxfSg/Ojo/IHxbLS9dKVxkezEsMTJ9KD86Oj8gfFstL10pXGR7NH0iCnMgPSAiTXkgbmFtZSBpcyBBTGkgRGF0ZSBpcyAwOS8wMy8yMDE4IgptID0gcmUuc2VhcmNoKHJ4LCBzKQppZiBtOgoJcHJpbnQoInt9IDogREFURVNUUiIuZm9ybWF0KG0uZ3JvdXAoKSkpCg==