Serhiy Storchaka added the comment:

Now patterns which could match only an empty string (e.g. '(?m)^$' or 
'(?<=\w-)(?=\w)') are rejected at all. They never worked with current regex 
engine. Updated the documentation.

Could anyone please make a review and correct my wording. It is desirable to 
get this in alpha 1 and receive early feedback.

----------
Added file: 
http://bugs.python.org/file37765/re_deprecate_split_zero_width_2.patch

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