From end to start how to get everything from the 5th occurence of "-"?

I have this string:
abc-8479fe75-82rb5-45g00-b563-a7346703098b

I want to go through this string starting from the end and grab everything till the 5th occurence of the "-" sign.

how do I substring this string to only show (has to be through the procedure described above): -8479fe75-82rb5-45g00-b563-a7346703098b

>Solution :

According to your string rules, I would do a simple split :

var text = "abc-8479fe75-82rb5-45g00-b563-a7346703098b";
var split = text.split('-');
if (split.Lenght <= 5)
   return text;
return string.Join('-', split.Skip(split.Lenght - 5);