code: public Set<String> getPropertyBundleNameSet() {
  
  		Set<String> bundleNameSet = new HashSet<>();
  
  		for (Object key : props.keySet()) {
  			Matcher matcher = bundleNamePattern.matcher((String) key);
  			if (matcher.matches()) {
  
  				String id = matcher.group(2);
  				bundleNameSet.add(id);
  			}
  		}
  		return bundleNameSet;
  	}
docs: Returns the set of names for the bundles
  
  @return the set of names for the bundles