I'm learning how to use the replace function within go templating but I'm running into an issue.

I have my template build this:

  - cpuRequest: 200m
    etcdMembers:
    - instanceGroup: master-us-east-1a
      name: us-east-1a
    - instanceGroup: master-us-east-1d
      name: us-east-1d
    - instanceGroup: master-us-east-1f
      name: us-east-1f

and I want it to build this:

  - cpuRequest: 200m
    etcdMembers:
    - instanceGroup: master-us-east-1a
      name: a
    - instanceGroup: master-us-east-1d
      name: d
    - instanceGroup: master-us-east-1f
      name: f

I'm currently using this function:

  {{ range $i, $az := .availability_zones }}
    - instanceGroup: master-{{ . }}
      name: {{  . | replace $.region "" }} {{/* converts us-east-1a to a */}}
  {{ end }}

Unfortunately what I'm doing is not converting us-east-1a to just a. Any thoughts?