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

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Interesting. That shifts the issue, since the current behavior is neither of the two that make sense. Then it would indeed make the most sense to raise in these cases.

(I wonder what these patterns actually would match, but I have no time to look in the sre sources right now...)

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