public static void main(String[] args) {
        String ss1 = "/admin/review/codeReview.action";
        String ss2 = "/review/codeReview.action";
        String reg = "(/\\w+)+(\\.action)";
        //String reg = "(/\\w+)+(\\.\\w+)";  //不管后缀名采用此
        System.out.println(ss1.matches(reg));
        System.out.println(ss2.matches(reg));
    }

------解决方案--------------------
Java code

    public static void main(String[] args)
    {

        List<String> list = new ArrayList<String>();
        list.add("/admin/123/codeReview.action");
        list.add("/admin/review/codeReview.action");
        list.add("/review/codeReview.action");
        String reg = "(?:/\\w+)*/(\\w+)(?:/\\w+\\.action)";

        for (String ss : list)
        {
            Pattern p = Pattern.compile(reg);
            Matcher m = p.matcher(ss);
            if (m.matches())
            {
                System.out.println(m.group(1));
            }
        }
    }

------解决方案--------------------

Java code

            String ss1 = "/admin/review/codeReview.action";
            String ss2 = "/review/codeReview.action";
            String reg = "/(\\w+)(/\\w+)(\\.action)";
            Pattern p = Pattern.compile(reg);            
            Matcher m = p.matcher(ss1);
            if (m.find()){
                System.out.println("group: " + m.group(1));                
            }
            m = p.matcher(ss2);
            if (m.find()){
                System.out.println("group: " + m.group(1));                
            }

------解决方案--------------------
String ss = "/admin/review/codeReview.action";
String[] s = ss.split("/");
System.out.println(s[s.length-2]);

这样好像也可以哦。。。