get_subnets.yml

---
- name: Get subnets list for VNet
  hosts: localhost
  gather_facts: False
  vars:
    subnets_inventory: "subnets.ini"
    low_limit: 6
    high_limit: 250
  tasks:
  - name: Get list of non-infra subnets
    azure_rm_virtualnetwork_facts:
      resource_group: "{{customer}}-generic-rg"
      name: "{{customer}}-vnet"
    register: output

  - name: Clear "subnets.ini" contents
    file:
      path: "{{subnets_inventory}}"
      state: absent
  - file:
      path: "{{subnets_inventory}}"
      state: touch

  - name: Populate "subnets.ini" with non-infra subnets' names
    loop: "{{output.virtualnetworks[0].subnets}}"
    when:
      - item.address_prefix.split('.')[2] | int > low_limit
      - item.address_prefix.split('.')[2] | int < high_limit
    lineinfile:
        path: "{{subnets_inventory}}"
        create: yes
        # regexp: undefined # not required. The regular expression to look for in every line of the file. For C(state=present), the pattern to replace if found. Only the last line found will be replaced. For C(state=absent), the pattern of the line(s) to remove. Uses Python regular expressions. See U(http://docs.python.org/2/library/re.html).
        line: "{{item.name}}"