code: public List<String> findOnlyExistingMatchingObjectNames(String objectExpression) {
          String[] parts = objectExpression.split(",");
  
          List<String> allSortedObjectNames = getSortedObjectNames();
          List<String> resultingObjectNames = new LinkedList<>();
  
          for (String part : parts) {
              String singleExpression = part.trim();
              if (!singleExpression.isEmpty()) {
                  if (GalenUtils.isObjectGroup(singleExpression)) {
                      resultingObjectNames.addAll(findObjectsInGroup(GalenUtils.extractGroupName(singleExpression)));
                  } else if (GalenUtils.isObjectsSearchExpression(singleExpression)) {
                      Pattern objectPattern = GalenUtils.convertObjectNameRegex(singleExpression);
                      for (String objectName : allSortedObjectNames) {
                          if (objectPattern.matcher(objectName).matches()) {
                              resultingObjectNames.add(objectName);
                          }
                      }
                  } else if (objects.containsKey(singleExpression)) {
                      resultingObjectNames.add(singleExpression);
                  }
              }
          }
          return resultingObjectNames;
      }
docs: Find all objects that match galen object statements
  @param objectExpression - Galen object statements
  @return