I have a task where I am updating a line in a file with a comma separated 
list of inventory hosts, this works for the hard coded case:

- name: Set host list
    lineinfile: dest=/home/project/pom.xml 
regexp='<targetHosts>.*</targetHosts>' line='<targetHosts>{{ 
groups.tag_Type_targettype | intersect('groups.key_mykey) | join(', ') 
}}</targetHosts>'

key_mykey is a group generated from ec2 properties in a dynamic inventory 
using:

  - name: Create groups based on ec2 access key
    group_by: key=key_{{ ec2_key_name }}


The issue I'm facing is that I need to be able to generate the intersection 
'key_<MYKEY>' from a variable so that I can generate different 
intersections at playbook runtime.

I have tried different ways to use a variable for <MYKEY>, most give a 
runtime error, the following does not, but it also generates an empty hosts 
list.

  vars:
    ec2keyname: mykey

intersect('groups.key_' + ec2keyname)

Is there a way to use a variable in the intersection groups name?

Andy

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