code: def _parse_trunk_allowed_vlans(self, config):
          
          match = re.search(r'switchport trunk allowed vlan (.+)$', config, re.M)
          return dict(trunk_allowed_vlans=match.group(1))
docs: Scans the specified config and parse the trunk allowed vlans value
  
          Args:
              config (str): The interface configuration block to scan
  
          Returns:
              dict: A Python dict object with the value of switchport trunk
                  allowed vlans value.  The dict returned is intended to be
                  merged into the resource dict