regex puzzle

[Harvey Thomas]

Mike Brown wrote:
> 
> I need an example of a regular expression that:
> 
> - matches an empty string
> - matches a non-empty string
> - does NOT match a string consisting of only a linefeed
> 
> So, this test should produce [1, 1, 0]...
> 
> import re
> pat = '^(.+)?$' # FIXME
> [(re.search(pat, s) is not None) for s in ['', 'foo', '\n']]
> 
> Any suggestions? :)
> 

Why do you need a regex, or is there something you've missed out. As stated above, how about:

>>> [s != '\n' for s in ['', 'foo', '\n']]
[1, 1, 0]


Harvey

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