正则表达式不区分大小写替换

 今天要写一个全文检索替换玩个正则试试 

public static String replaceIgnoreCaseReplace(String source, String oldstring,
      String newstring)
 {
         Pattern p = Pattern.compile(oldstring, Pattern.CASE_INSENSITIVE);
         Matcher m = p.matcher(source);
         String ret=m.replaceAll(newstring);
         return ret;
 }