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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _num_plurals(self, catalogue):
 """ Return the number of plurals for this catalog language, or 2 if no plural string is available. """

        match = re.search(r'nplurals=\s*(\d+)', self.get_plural(catalogue) or '')
        if match:
            return int(match.groups()[0])
        return 2