Depends on the format of the selected row, if it is always the format 1char1number (E0,E1....E34) then you can do:
var row = "E0";
var rowChar = row.substring(0, 1);
// Number var is string format, use parseInt() if you need to do any maths on it
var number = row.substring(1, row.length);
//var number = parseInt(row.substring(1, row.length));
If however you can have more than 1 character, for example (E0,E34,EC5,EDD123) then you can use regular expressions to match the numeric and alpha parts of the string, or loop each character in the string.