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Sanitizers pass replacement_text and reserved-name handler results directly to re.sub, which interprets backslash escapes as regex replacements. A literal \n becomes a newline, \1 raises an invalid-group error, and a trailing backslash raises re.error.
Use replacement callables so the provided text is inserted literally in both filename/path sanitization and reserved-name handling. Existing path normalization and separator handling remain in place. Eleven regressions cover escapes, group references and trailing backslashes.
Validation: all 11 cases fail before the patch; full Python 3.13 tox suite passes (4,178 passed, 17 skipped). Configured pyright/codespell/Ruff formatting pass. The full-tree Ruff check reports 129 existing diagnostics, unchanged from a clean HEAD archive, with no new diagnostics. Twelve existing runtime/test warnings remain.