Need help with using REGEXP in my SELECT statement

I have a field that contains a list of numbers seperated by commas.

For example, my field would contain something like this:
15,25,16,17,13,16

I only want to search for the very last item in the list. In this case it would be 16. My current SELECT looks like this:

SELECT * FROM table where column REGEXP ‘,[[:<:]]16[[:>:]]$’

It returns no records. Whats wrong with my SELECT?

use the SUBSTRING_INDEX function for this, with -1 to indicate the last item in the list