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

[John Machin]

John Machin <sjmachin at lexicon.net> added the comment:

@ezio: Of course the context is "inside a character class".

I expect r'[\b]' to act like r'\b' aka r'\x08' aka backspace because (1) that is the treatment applied to all other C-like control char escapes (2) the docs say so explicitly: "Inside a character range, \b represents the backspace character, for compatibility with Python’s string literals."

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