[issue20678] re does not allow back references in {} matching operator

[Matthew Barnett]

Matthew Barnett added the comment:

Yes.

If it's not a valid repeat, then it's treated as a literal.

Perl does the same.

By the way, "\1" isn't a group reference; it's the same as "\x01". You should be either doubling the backslashes ("\\1") or using a raw string literal (r"\1").

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<http://bugs.python.org/issue20678>
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