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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I presume you intend regex to match the spec rather than bugs. So if re has a bug in an obsure corner case and the spec is ambiguous, as I have the impression is the case here, using the interpretation embodied in regex would avoid creating a conflict.

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