public boolean isNoiseWord(String string) {
			// TODO Auto-generated method stub
			string = string.toLowerCase().trim();
			Pattern MY_PATTERN = Pattern.compile(".*[a-zA-Z]+.*");
			Matcher m = MY_PATTERN.matcher(string);
			// filter @xxx and URL
			if(string.matches(".*www\\..*") || string.matches(".*\\.com.*") || 
					string.matches(".*http:.*") )
				return true;
			if (!m.matches()) {
				return true;
			} else
				return false;
		}