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regex_pattern = r"^(?!.*(I{4}|V{2,}|X{4}|L{2,}|C{4}|D{2,}|M{4})).*$"
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Validating Roman Numerals
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regex_pattern = r"^(?!.*(I{4}|V{2,}|X{4}|L{2,}|C{4}|D{2,}|M{4})).*$"