[docs] [issue13899] re pattern r"[\A]" should work like "A" but matches nothing. Ditto B and Z.

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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stage:  -> needs patch
versions: +Python 3.3, Python 3.4

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<http://bugs.python.org/issue13899>
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