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una descripción alternativa es que un subpatrón de este tipo case los caracteres de la cadena que un patrón fijo emparejaría, si estuviera anclado en el punto actual de la cadena de entrada.
vertical bar characters are used to separate alternative patterns. for example, the pattern gilbert_bar_sullivan matches either "gilbert" or "sullivan". any number of alternatives may appear, and an empty alternative is permitted (matching the empty string). the matching process tries each alternative in turn, from left to right, and the first one that succeeds is used. if the alternatives are within a subpattern (defined below), "succeeds" means matching the rest of the main pattern as well as the alternative in the subpattern.
Last Update: 2011-10-24
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