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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 _load_physical_network_mappings(self, phys_net_vswitch_mappings):
 """Load all the information regarding the physical network."""

        for mapping in phys_net_vswitch_mappings:
            parts = mapping.split(':')
            if len(parts) != 2:
                LOG.debug('Invalid physical network mapping: %s', mapping)
            else:
                pattern = re.escape(parts[0].strip()).replace('\\*', '.*')
                pattern = pattern + '$'
                vswitch = parts[1].strip()
                self._physical_network_mappings[pattern] = vswitch