- name: install nginx
  apt:
    name:
      - nginx
    state: present
    update_cache: yes

- name: define www user as default user
  replace:
    path: "/etc/nginx/nginx.conf"
    regexp: '{{ item.from }}'
    replace: "{{ item.to }}"
  with_items:
    - {from: '^user (.+);$', to: 'user {{ www_user }};'}
  notify: restart nginx