Remove all Docker images filtered by `pattern` except latest `n`

docker_image_cleanup.sh

#some grep pattern
pattern=192.168
# save latest n images
n=1
# check first (?):
# docker inspect -f '{{ .Created }} {{ .Id }} {{ .RepoTags }}' $(docker images | tail -n+2 | sed 's/^\([^ ]*\) *\([^ ]*\) *\([^ ]*\).*/ \1:\2 \3 /' | grep $pattern | cut -d' ' -f3) | sort -r | tail -n+$((n+1))
docker rmi $(docker inspect -f '{{ .Created }} {{ .Id }}' $(docker images | tail -n+2 | sed 's/^\([^ ]*\) *\([^ ]*\) *\([^ ]*\).*/ \1:\2 \3 /' | grep $pattern | cut -d' ' -f3) | sort -r | tail -n+$((n+1)) | cut -d' ' -f2 | cut -c8-)

I tried your script but it didnt behave as I expected so I came up with this:
https://stackoverflow.com/questions/58406115/print-first-n-rows-per-group-remove-all-docker-images-except-newest-n-for-eac