Determine sanitized palindrome in string
Overview
This question evaluates string manipulation, text sanitization, Unicode-aware character classification, and algorithmic complexity reasoning, and falls under the Coding & Algorithms domain.
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Sep 6, 2025, 12:00 AM
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Write a function that determines whether a string is a palindrome after removing non-alphanumeric characters and ignoring case (e.g., punctuation, whitespace, symbols). Provide time and space complexity, and include tests covering edge cases with special characters and Unicode.