public static String trimQuotes(String s) {
		if (s == null || s.isEmpty())
			return s;
		StringBuilder builder = new StringBuilder(s);
		while (builder.length() > 0) {
			char head = builder.charAt(0);
			if (head == '\'' || head == '\"')
				builder.deleteCharAt(0);
			else
				break;
		}
		while (builder.length() > 0) {
			char tail = builder.charAt(builder.length() - 1);
			if (tail == '\'' || tail == '\"')
				builder.deleteCharAt(builder.length() - 1);
			else
				break;
		}
		return builder.toString();
	}