gh-153177: Deprecate re.LOCALE#153178
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The flag only works with bytes patterns in 8-bit locales and makes matching much slower. Emit a DeprecationWarning when a pattern uses the flag or the inline flag (?L). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-authored-by: Stan Ulbrych <stan@python.org>
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Emit a
DeprecationWarningwhen a compiled pattern uses there.LOCALEflag or the inline flag(?L)(also in the scoped form(?L:...)). The warning is emitted once per actual compilation, from a single place in the compiler, and points at the caller of therefunction.The flag only works with bytes patterns in 8-bit locales and makes matching much slower. Planned removal is no earlier than Python 3.18.