/**
	 * 正则表达式对大写html标签进行转换成小写
	 * */
	public static String tagNameToLowerCase(String html){
		StringBuffer result = new StringBuffer();
		Pattern pattern = Pattern.compile("<([^>\\s]+)");
		Matcher m = pattern.matcher(html);
		while (m.find()) {
			m.appendReplacement(result,"<" + m.group(1).toLowerCase());
		}
		m.appendTail(result);
		return result.toString();
	}