str2 ="2018-10-29"
c =re.sub(r"(\d{4})-(\d{2})-(\d{2})","\g<1>/\g<2>/\g<3>",str2)
print(c)
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str2 ="2018-10-29"
c =re.sub(r"(\d{4})-(\d{2})-(\d{2})","\g<1>/\g<2>/\g<3>",str2)
print(c)
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