Unpacking serial data from arduino

Processing Electronics (Arduino, etc.)
8 
void serialEvent(Serial p) { //___________________ handle serial data
  String data = trim(p.readStringUntil('\n'));
  if (data != null) {


String[] datas = val.split(data, ",") ;

or

int[] datai = int(val.split(data, ",") );

    if ( datai.length >=3 ) {
//...
    }
  }
}

oh, but "," or ',' should be same but ' , ' does not work

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