- name: get all HKUs
  win_reg_stat:
    path: HKU:\
  register: all_hkus
  failed_when: not all_hkus.exists or ((all_hkus.sub_keys | default([])) | length == 0)


- name: filter HKUs that are valid and correspond to actual users
  set_fact:
    good_hkus: "{{ all_hkus.sub_keys | select('match', '^S-1-5-21-\\d+-\\d+-\\d+-\\d+$') | list }}"
  failed_when: (good_hkus | default([]) | length) == 0


- debug:
    msg: "got HKUs: {{ good_hkus | join(', ') }}"


- name: combine HKUs with root HKU to form a full registry path
  set_fact:
    hkus: "{{ good_hkus | map('regex_replace', '^(.*)$', 'HKU:\\\\\\1') | list }}"