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This fixes the unit test in the Docker container, but what about someone who runs the test outside of this container (i.e.: everybody other than CI) who doesn't happen to have LANG=en_US.UTF-8 setup in their environment?
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At a minimum, we should document this requirement for correct behavior for regexp handling of Unicode text. We could also consider falling back to CPU if
LANG != en_US.UTF-8
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I just want to make sure this issue isn't considered "fixed" because we finally got the tests to pass. Filed #5629 to track it.
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Yes, updated the PR as my comment. It doesn't fix the issue, but prepare the condition to fix it in test scripts.