> Which of course does not work. I cannot express the fact: sentence > have 0 or 1 whitespace, separation of group have two or more > whitespaces. > > Any suggestion ? Thanks a bunch ! How about this:
>>> import re
>>> s = ' hello world how are you'
>>> re.split(r"\s{2,}",s)
['', 'hello world', 'how are you']
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