[3.13] gh-156444: Fix a negated character set with IGNORECASE and LOCALE (GH-156445) - #156458
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serhiy-storchaka merged 1 commit intoAug 27, 2026
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…LE (pythonGH-156445) charset_loc_ignore() tested the whole set once per locale case and took the disjunction, which complements a set before closing it under case instead of after: [bc] matched b'B', but so did [^bc]. Match both cases of the character against every set member instead. (cherry picked from commit 6671d27) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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charset_loc_ignore() tested the whole set once per locale case and took
the disjunction, which complements a set before closing it under case
instead of after: [bc] matched b'B', but so did [^bc]. Match both cases
of the character against every set member instead.
(cherry picked from commit 6671d27)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: Claude Opus 5 (1M context) noreply@anthropic.com
re.IGNORECASE | re.LOCALE: a negated character set matches the other case #156444