String name = "D:\\wy\\音频\\邓丽君-北国之春.mp3";
name = name.substring(name.lastIndexOf("\\") + 1, name.length());
Pattern p = Pattern.compile("(.+)-{1}(.+).mp3{1}");
Matcher m = p.matcher(name);
while(m.find()){
    System.out.println("歌手：" + m.group(1) + ";歌曲: " + m.group(2));
}

------解决方案--------------------
探讨

其实不用正则都可以，
File file = new File(path);
file.getName();