Someone

 private String dobetween(String begin, String end, String source){
        //First of all we will create a single-line-doc:
        source = source.replace("\n", "");
        source = source.replace("\r\n", "");
        Pattern p = null;
        Matcher m = null;
        String result = null;
          p = Pattern.compile(begin+"(.*)"+end);
          m = p.matcher(source);
          if(m.find()){   result = m.group(1);   
          return(result); } else { return(""); }
    }