Simple regex with whitespaces

[Mark Peters]

>   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']