How to remove all characters except the last ones?

Question

Regular Expressions

Hello, there is a lot of manual on regular expressions, but I didn't find the answer. SOURCE STRING
blokupravlenijaimmobilajzeromalfaromeo14614i199838930-1
TASK 1. remove all characters except the last five to get "930-1"
2. remove all characters except the last five after the last hyphen "38930" Thank you in advance!

Answer 1

remove all characters except the last five to make "930-1"

Working example: regexr.com/3spqe .
We find 5 characters before the end of the line, you can add the necessary characters.
Working example: regexr.com/3spqb . Hover over the found fragment to see the contents of the first group.
We find a dash before the end of the line and take 5 characters before. They are in group #1 or named "last".
Working example: regexr.com/3spsa Lookahead
is used here.

Answer 2

you have a second condition with an example not from him
to expand your consciousness, use the advice: "not in one action", and not even all actions should be regexps
write what you do and what does not work