Hi Gurus,

Need help in getting the Apex class to working to output a string of comma-delimited years and year ranges,and remove all duplicates and invalid inputs.
 

public class SortYearAndYearRangesString{
public static List<Integer> sortSpecialString(String input){
    List<String> inputList = input.split(',');
    Set<Integer> output = new Set<Integer>();
    system.debug('input ' + input);
    system.debug('inputList ' + inputList);
    for (String s : inputList){
        Set<Integer> tempSet = new Set<Integer>();
        s.remove(' ');
        if (s.contains('-')){
            //// break the ranges and fill in years
            List<String> tempSet2 = s.split('-');
            for (String s2 : tempSet2){
                try{
                    ///capture valid integers
                    Integer tempInt = Integer.valueOf(s2);
                    tempSet.add(tempInt);
                } catch (Exception e){
                    tempSet.clear();
                    break;
                }
            }
            System.debug('set ' + tempSet);
            if (tempSet.size() > 1){
                List<Integer> tempList = new List<Integer>(tempSet);
                tempList.sort ();
                Integer r = tempList.size() - 1;
                // iterate through the years
                for (Integer i = tempList.get(0); i < tempList.get(r); i++){
                    tempSet.add(i) ;
                }
            }
        } else{
            try{
                ///capture valid integers
                Integer tempInt = Integer.valueOf(s);
                tempSet.add(tempInt);
            } catch (Exception e){
                continue;
            }
        }
        output.addAll(tempSet);
    }

    // output is currently set of ints, need to convert to list of integer

    List<Integer> finalOutput = new List<Integer>(output);
    finalOutput.sort ();
    System.debug('finalOutput :' + finalOutput);
    return finalOutput;
}}

Here is anonymous apex output
 

public static void validateSolution() {
             String input = '2017, 2018,2020-2023,1800-1700,2020,20a9,19z5-1990,2025,20261,2013';
             List<Integer> expected = new List<Integer> {2013,2017,2018,2020,2021,2022,2023,2025};
             List<Integer> actual = SortYearAndYearRangesString.sortSpecialString(input);
             
             System.assertEquals(expected, actual, 'Invalid Results');
             }
            }

Your Help is highly appreciated

Fiona​​​​​​​