How can I pass predefined variable to playbook's “- hosts: ”POD_'+VARIABLE+'_master_sn“”

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I need to read VARIABLE from some pre-defined file, not from the console.

I have a file named “all” under group_vars with predefined variable, the value of which can be changed, let say, from “C” to "D’ depends on what I need:

`
VARIABLE: C

`

Also, I have a task under my playbook:


- hosts: "POD_'+VARIABLE+'_master_sn" # or - hosts: "{{ 'POD_' + source_pod_name_capital_letter + '_master_sn' }}"
  tasks:
    - include_role:
        name: sn_static_hosts 
        tasks_from: remove

As you can see, I want to perform concatenation, but getting this:

`
[WARNING]: Could not match supplied host pattern, ignoring: POD_‘+source_pod_name_capital_letter+’_master_sn

or this:

ERROR! The field ‘hosts’ has an invalid value, which includes an undefined variable. The error was: ‘source_pod_name_capital_letter’ is undefined

`

I have tried to play with brackets, removed/added “+” etc, but got only warnings or errors.

Is that possible to have this kind of concatenation?