正则表达式替换html标签中大写字母为小写字母

/**
* 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();
}