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import re
 
for s in [ "xyzzyxxyzzyxxyzzyx", "abcbaccbaabcbaccbaabcbaccba", "iiiiiiiiiiiiiiiiii" ]:
  print(re.sub(r'(.+?)\1+', r'\1', s))

Success #stdin #stdout 0.08s 10864KB

stdin

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Standard input is empty

stdout

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xyzzyx
abcbaccba
i

https://ideone.com/M8ZzM

language:

Python (cpython 2.7.16)

created:

visibility:

public

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