code: def parse_string(self,string,best=False):
          '''Parses ``string`` trying to match each word to a :class:`Concept`. If ``best``, will only return the top matches'''
          if isinstance(string,list):
              items = string
          else:
              items = string.split()
          item_list = []
          not_next = False
          for item in items:
              if self.negative:
                  if item=='not':
                      not_next = True
                      continue
                  if item[0]=='-':
                      not_next = True
                      item = item[1:]
              concepts = self.match_all_concepts(item)
              if len(concepts)>0:
                  if not_next:
                      for concept in concepts:
                          concept.negative = True
                  if best:
                      item_list.append(concepts[0])
                  else:
                      item_list.append(concepts)
              else:
                  item_list.append(item)
              not_next = False
          return item_lisf parse_string(self,string,best=False):
          '''Parses ``string`` trying to match each word to a :class:`Concept`. If ``best``, will only return the top matches'''
          if isinstance(string,list):
              items = string
          else:
              items = string.split()
          item_list = []
          not_next = False
          for item in items:
              if self.negative:
                  if item=='not':
                      not_next = True
                      continue
                  if item[0]=='-':
                      not_next = True
                      item = item[1:]
              concepts = self.match_all_concepts(item)
              if len(concepts)>0:
                  if not_next:
                      for concept in concepts:
                          concept.negative = True
                  if best:
                      item_list.append(concepts[0])
                  else:
                      item_list.append(concepts)
              else:
                  item_list.append(item)
              not_next = False
          return item_list
docs: Parses ``string`` trying to match each word to a :class:`Concept`. If ``best``, will only return the top matches