How to split a string with a delimiting regular expression like "\r"

Question

Hello!I am a fresh in java programming.Please don't deride my question.What I want to realize is to get the current caret lines and cols in a JTextPane. My question is :After I fetch the string content of the JTextPane and try to split it with the end-line token like "\r" or "\r\n",it always comes me an wrong position.
here is my code:
public void caretUpdate(CaretEvent e) {
int ln,col;
JTextPane textSource = (JTextPane)e.getSource();
String sourceString = textSource.getText();
String subString = sourceString.substring(0,
     (e.getDot() == 0) ? 0 : e.getDot()-1);
String[] splitString = subString.split("\r",-1);
ln = splitString.length;
col = e.getDot() - subString.lastIndexOf("\r");
setCaretPosition(ln,col); //display ln and col in a label
I have got puzzled>_<.Please help me.Any help would be appreciated . (^-^)

Answer 1

Swing text components always use "\n" to separate lines, not "\r" or "\r\n". When you read text in from a file or paste from the clipboard, the line separators are converted to "\n" if necessary. They save the info about what line separators were used in the source file, so if you write the text back to a file it converts them back.