[docs] [issue28450] Misleading/inaccurate documentation about unknown escape sequences in regular expressions

[Matthew Barnett]

Matthew Barnett added the comment:

@Barry: repl already supports some escapes, e.g. \g<name> for named groups, although not \xXX et al, so deprecating unknown escapes like in the pattern makes sense to me.

BTW, the regex module already supports \xXX, \N{XXX}, etc.

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