This works under a regexp tester, but fails under ansible.  I don't know 
how to correct it.

Basically, it finds the lines starting with passwd or group, looks in the 
lines for sss, and appends if it isn't found.

- name: Update nsswitch.conf
  replace:
    path: /etc/nsswitch.conf
    regexp: "{{item.regexp}}"
    replace: "{{item.replace}}"
  with_items:
    - {regexp: '^(?:passwd):\s+(?:(?!sss).)+$', replace: '\0 sss'}
    - {regexp: '^(?:group):\s+(?:(?!sss).)+$', replace: '\0 sss'}
  notify: restart sssd

Actual results (it wipes out the match and adds " sss")
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

 sss
shadow:     files
 sss

#hosts:     db files nisplus nis dns
hosts:      files dns


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