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 String s = "xxxx.js.jss";//目标字符串
        String regex = "((?!\\.((css)|(html)|(js)|(json)|(xml))$).)+";//正则表达式
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(s);
        if (m.matches()) {
            System.out.println("匹配");
        } else {
            System.out.println("不匹配");
        }