例如:
<h1>内容<h1>

正则表达式:

/<.+?>(.+?)<.+?>/

Java实现:

String htmlStr = "<h1>XXX<h1/><h2>YYY<h2/>";

        Pattern pattern = Pattern.compile("<.+?>(.+?)<.+?>");
        Matcher matcher = pattern.matcher(htmlStr);
        // 获得结果集
        while (matcher.find()) {
            System.out.println(matcher.group(1));
        }