The gcloud compute instances list command supports the --filter flag, which can combine multiple predicates with an implicit AND.
status=RUNNING selects only running VMs.
zone:(europe-west1-*) matches every zone whose name starts with europe-west1- (all zones in the region).
name~'^web-.*' applies a regular-expression filter so that only instances whose names start with web- are returned. Because all three predicates are combined in a single --filter expression, the output shows exactly the desired subset. The other commands are invalid or ignore one of the requirements: they rely on the nonexistent region field, pass an unsupported --region flag, or supply an invalid value to --zones.
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