一个字符处理题！该怎么解决

一个字符处理题！
ScanSite
ScanType
SendSite
........

写一个方法将ScanSite 等字符 转换为 SCAN_SITE 等```
谁能帮个忙啊

[解决办法]
答:参考代码:

Java code

public  static String ps(String s)    {        String rs=s.replaceAll("([A-Z])", "_$1");        return s.charAt(0)=='_'?rs.toUpperCase():rs.substring(1).toUpperCase();    }        public static void main(String[] args) throws Exception {        // TODO Auto-generated method stub        System.out.println("ScanSite=>"+ps("ScanSite")+"\n"+                           "ScanType=>"+ps("ScanType")+"\n"+                           "SendSite=>"+ps("SendSite"));}