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'NumberToDelimitedConverter' utiliza una expresión regular basada en lookahead con 'gsub!' para insertar delimitadores de millares. Antes de las versiones 8.1.2.1, 8.0.4.1 y 7.2.3.1, la interacción entre el grupo lookahead repetido y 'gsub!' puede producir una complejidad de tiempo cuadrática en cadenas de dígitos largas. 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