Regex for splitting word / (slash) word

Question

I really need a regex expert: I need a regex expression (in java) for splitting this examples:

Hello/World (word/word) => Hello,World

Hello/12 (word/number) => Hello,12

15/Hello (number/word) => 15,Hello

12/17 (number/number) => 12/17 (Do not split)

Update:

This is what I tried but it also mark the number/number option https://regex101.com/r/zZ9nO5/2

Thanks

Answer 1

It might not be the most elegant solution but for your requirement you can do it like that:

(([a-zA-Z]+?)/([a-zA-Z]+))|(([a-zA-Z]+?)/([\d]+))|(([\d]+?)/([a-zA-Z]+))

It's a check for word / word, word / number and number / word

replace with the corresponding groups found \2\5\8,\3\6\9

A simple java program for that would be:

  public static void main(String[] args) {
            String[] stringArray=new String[]{"Hello/World","Hello/12","15/Hello","12/17"}; 
            for(String s:stringArray) {
                System.out.println(s.replaceAll("(([a-zA-Z]+?)/([a-zA-Z]+))|(([a-zA-Z]+?)/([\\d]+))|(([\\d]+?)/([a-zA-Z]+))", "$2$5$8,$3$6$9"));
            }
        }

Result is:

Hello,World
Hello,12
15,Hello
12/17