I know this type of questions have been asked before but none solves my problem.

1. I want to capture numeric parts of this string `INFORMATICS&SYSTEMS-58600` i.e. `58600`.
2. I am trying to do `substr(INFORMATICS&SYSTEMS-58600,-5)` which returns `ATICS` which is substr of first part of string `INFORMATICS` but I want the last part.
3. Wherever & is appearing this is behaving same.

I know its a very basic mistake but what ??? I cant figure out.Please help me out.