用正则表达式提取字符串中最后一个"/"结束的字符串,该怎么解决

        String str="d:/123/456/789.txt";        System.out.println(str.substring(0,str.lastIndexOf("/")));
------解决方案--------------------
String result = "d:/123/456/789.txt".replaceAll("/[^/]+$","");