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  1. import re
  2. while 1:
  3.     str = raw_input()
  4.     if not str : break
  5.     if re.search('(^[LR]_|_[LR](_|$))', str):
  6.     	str = re.sub(r'(^[LR](?=_)|(?<=_)[LR](?=(?:_|...$)))(.*)(?=.*\1(.))...$', 
  7.     	             r'\3\2', str+"LRL")
  8.     print(str)
Success #stdin #stdout 0.01s 7900KB
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L_test
R_test
test_L_test
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test_R
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R_test
L_test
test_R_test
test_L_test
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test_L
https://ideone.com/LRX4gt
language:
Python (cpython 2.7.16)
created:
11 years ago
visibility:
public

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