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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 _get_ext_net_name_gbp(self, network_name):
 """Get the external network name The name of the external network used in the APIC configuration file can be different from the name of the external network in Neutron, especially using the GBP workflow """

        prefix = network_name[:re.search(UUID_REGEX, network_name).start() - 1]
        return prefix.strip(APIC_OWNED)