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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"AttributeError when copying flags in the `re` module.","articleBody":"**Bug report**\r\n\r\nIn CPython 3.11, I've noticed that an attempt to copy (combined) regular expression flags fails with an attribute error; like so:\r\n\r\n```\r\n\u003e\u003e\u003e import copy, re\r\n\u003e\u003e\u003e copy.copy(re.A | re.I)\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"lib/python3.11/copy.py\", line 102, in copy\r\n    return _reconstruct(x, None, *rv)\r\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"lib/python3.11/copy.py\", line 265, in _reconstruct\r\n    y = func(*args)\r\n        ^^^^^^^^^^^\r\n  File \"lib/python3.11/enum.py\", line 862, in __getattr__\r\n    raise AttributeError(name) from None\r\n    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\nAttributeError: ASCII|IGNORECASE\r\n```\r\n\r\n**Your environment**\r\n\r\n- CPython versions tested on: 3.11.0b3\r\n- Operating system and architecture: macOS 10.15.7\r\n\r\n\r\n**Background**\r\n\r\nThis behavior was detected from a [CrossHair test failure here](https://github.com/pschanely/CrossHair/blob/4abaac436f383abf3bcc705a4a521d9cd824d4e5/crosshair/libimpl/relib_test.py#L220), in which we realize possibly symbolic arguments prior to regex compilation. (it's an esoteric use case, and I expect not very high priority)","author":{"url":"https://github.com/pschanely","@type":"Person","name":"pschanely"},"datePublished":"2022-06-14T18:01:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/93820/cpython/issues/93820"}