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;
	}