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consider the following pat - tern, which contains non-significant white space to make it more readable (assume the pcre_extended option) and to divide it into three parts for ease of discussion: (\ ()? [^()] + (?(1)\)) the first part matches an optional opening parenthesis, and if that character is present, sets it as the first capturedconsider the following pat - tern, which contains non-significant white space to make it more readable (assume the pcre_extended option) and to divide it into three parts for ease of discussion: (\ ()? [^()] + (?(1)\)) the first part matches an optional opening parenthesis, and if that character is present, sets it as the first captured substring.
por esto, mientras ambos \d + y \d? están preparados para ajustar el número de dígitos que emparejan para hacer que el resto del patrón case, (? \d+) sólo puede emparejar un secuencia de dígitos entera.