Return the minions found by looking via regular expressions

def _check_pcre_minions(self, expr, greedy):  # pylint: disable=unused-argument
        '''
        Return the minions found by looking via regular expressions
        '''
        reg = re.compile(expr)
        return {'minions': [m for m in self._pki_minions() if reg.match(m)],
                'missing': []}