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  1. import re
  2. p = re.compile(r'^([ \t]*\d\.)\s+(?=\d+)', re.MULTILINE)
  3. s = """6. Some text ending in a number 2. 23-Feb-2012
  4.  6. 1 More text 3. 2017 is a year
  5.   6. 2
  6.    6. 7
  7. """
  8. res = p.sub(r"\1", s)
  9. print(res)
Success #stdin #stdout 0.01s 8968KB
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Standard input is empty
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6. Some text ending in a number 2. 23-Feb-2012
 6.1 More text 3. 2017 is a year
  6.2
   6.7
https://ideone.com/aA79K0
language:
Python (cpython 2.7.16)
created:
7 years ago
visibility:
secret

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