docs: def instances(self, test_type=".*"):
          """
          Returns a dict of all instances defined using a regex
  
          :param test_type: Regular expression to match for self.instance['test_type'] value names
          """
          import re
          data = {}
          for k, v in self.instances_dict.iteritems():
              if re.match(test_type, v.get('test_type'), re.IGNORECASE):
                  if 'filter_type' in v:
                      hostfilter = {
                          'filtertype': v['filter_type'],
                          'content': v['filter_value']
                      }
                  else:
                      hostfilter = {}
                  data[k] = {
                      'name': v.get('name'),
                      'start': v.get('start'),
                      'end': v.get('end'),
                      'url': v.get('url'),
                      'hostfilter': hostfilter,
                      'test_type': v.get('test_type')
                  }
          return data