[issue13723] Regular expressions: (?:X|\s+)*$ takes a long time

[Mark Dickinson]

Changes by Mark Dickinson <dickinsm at gmail.com>:


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superseder:  -> the re module can perform poorly: O(2**n) versus O(n**2)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13723>
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