code: def get_meshables(self):
          
  
          l = re.findall(r"[\w']+", self.get_value())
          # now search for indices of star and take the next entry from this flat list
          meshables = [l[i+1] for i,s in enumerate(l) if s in ['star', 'envelope']]
  
          # now we want to remove any star which has a sibling envelope
          has_sibling_envelope = []
          for item in meshables:
              if self.get_sibling_of(item, kind='envelope'):
                  has_sibling_envelope.append(item)
  
          return [m for m in meshables if m not in has_sibling_envelope]
docs: return a list of components that are meshable (generally stars, but handles
              the envelope for an contact_binary)