How to extract a part of a string in a CSV file and replace it with

How to extract a part of a string in a CSV file and replace it with

I am trying to search and replace the text with the following pattern in
the CSV file.
20130910-083850-msaifullah-2205859.jpg in the cell row of a CSV and needs
to be replaced with their respective text which is the last digits of the
name '2205859' and no extension before or after the numbers should be
outputted and replaced in the CSV.