code: def fill(self, postf_un_ops: str):
          
          for op, dic in self.ops.items():
              if 'postf' not in dic:
                  dic['postf'] = self.postf
          self.ops = OrderedDict(
              self.styles.spec(postf_un_ops) +
              self.other_styles.spec(postf_un_ops) +
              self.pref_un_greedy.spec() +
              list(self.ops.items())
          )
          for op, dic in self.ops.items():
              dic['postf'] = re.compile(dic['postf'])
          self.regex = _search_regex(self.ops, self.regex_pat)
docs: Insert:
            * math styles
            * other styles
            * unary prefix operators without brackets
            * defaults