issue2636-22 : Code : Python
lp:~pythonregexp2.7/python/issue2636-22
Created by TimeHorse and last modified
The current implementation of the Python Regular Expression Engine does not allow an expression to be found or split if the length of the Regular Expression match is of zero-length. Rather than splitting the given string as expected, it simply returns the original string in a single-element array, rather than an array containing each character as an element of the output list, as well as an empty string to represent the "first" and "last" characters of a string. For example:
>>> re.split(r'\b', 'a b')
['a b']
When one would expect this to return the list [ '', 'a', ' ', 'b', '' ]. Because some existing python code may expect the single-element unsplit list as a result of a Zero-Width expression, it is recommended that, at least initially, we provide a flag, re.ZEROWIDTH and re.Z as well as an In-Line flag (?z) to enable this behaviour. It may also be possible to add a 'from __future__ import ZeroWidthRegula
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- 39039. By Jeffrey C. "The TimeHorse" Jacobs <email address hidden>
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