[issue42871] Regex compilation crashed if I change order of alternatives under quantifier

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

It's not a crash. It's complaining that you're referring to group 2 before defining it. The re module doesn't support forward references to groups, but only backward references to them.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42871>
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