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  1. #!/bin/bash
  2. t='test-group us-west1-c zone default Yes 1'
  3. echo $t | grep -oE '[^[:blank:]-]*-[^[:blank:]-]*-[^[:blank:]-]*'
  4.  
Success #stdin #stdout 0s 4448KB
stdin
Standard input is empty
stdout
us-west1-c