docs: public static List<BufferedImage> loadImages( String directory , final String regex ) {
  
  		List<String> paths = UtilIO.listByRegex(directory,regex);
  
  		List<BufferedImage> ret = new ArrayList<>();
  
  		if( paths.size() == 0 )
  			return ret;
  
  		// Sort so that the order is deterministic
  		Collections.sort(paths);
  
  		for( String path : paths ) {
  			BufferedImage img = loadImage(path);
  			if( img != null )
  				ret.add( img );
  		}
  
  		return ret;
  	}