boolean hadDot=false;//this makes sure we don't split before finding the file extension
String file="",date="";
for(int i=0;i<text.length();i++){
  if(text.charAt(i)=='.'){
    hadDot=true;
    continue;
  }
  if(hadDot&&Character.isUpperCase(text.charAt(i))){
    file=text.substring(0,i);
    date=text.substring(i);
    break;
  }
}