I need to search the value of "EXIT_CODE=" in a log file and the result can vary between 0 and 4. The problem is that in this file the word "EXIT_CODE=" can be found several times and I would only like remember the last value found in the file.

Here is the command I did, but for now she can return me 20 different answers and I would only like the last one:
log["/var/log/puppet_agent.log", "EXIT_CODE=([0-9] +)",,, skip,\1]