String iskaniTekst = TextFieldSearch.getText();
Color c = Color.magenta;
StyledDocument d = TextPane.getStyledDocument();
Style s = TextPane.addStyle("IskanoBesedilo", null);
StyleConstants.setBackground(s, c);
int i = 0;
int prvi = -1;
int stevcek = 0;
while(true){
  i = TextPane.getText().indexOf(iskaniTekst, i);
  if(i == -1)
    break;
  if(prvi == -1)
    prvi = i;
  TextPane.select(i, i+iskaniTekst.length());
d.setCharacterAttributes(TextPane.getSelectionStart(),TextPane.getSelectionEnd()-TextPane.getSelectionStart(), s, false);
  stevcek++;
  i++;
}