Incorrect zones extracted from provided region

[ionic-polar]

Based on Load Balancing and Auto scaling - Challenge Lab :

the command to filter zones based on provided region is not only affecting europe region.

The brackets wrapping the $REGION is not allowing the filter to do exact match, which results in the zones retrieved to contain zones not found in the provided region, causing the creation of instance to fail.

Suggest to change
gcloud compute zones list --filter="region:($REGION)" --format="value(name)"
gcloud compute zones list --filter="region:($REGION_2)" --format="value(name)"
to
gcloud compute zones list --filter="region:$REGION" --format="value(name)"
gcloud compute zones list --filter="region:$REGION_2" --format="value(name)"