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gh-89973: Fix re.error in the fnmatch module. (GH-93072)

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Character ranges with upper bound less that lower bound (e.g. [c-a])
are now interpreted as empty ranges, for compatibility with other glob
pattern implementations. Previously it was re.error.
(cherry picked from commit 0902c3d8ed)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2022-06-05 02:39:03 -07:00 • committed by GitHub
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commit 2f8aae38b9
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Fix :exc:`re.error` raised in :mod:`fnmatch` if the pattern contains a
character range with upper bound lower than lower bound (e.g. ``[c-a]``).
Now such ranges are interpreted as empty ranges.