[docs] [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:

Whoops: "normal Python rules for backslash escapes" should have had a note "but revert to the C behaviour of stripping the \ from unrecognised escapes" which is what re appears to do in its own \ handling.

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