replace module: Invalid group reference

[John Harmon]

I am trying to append to some lines within the nsswitch file to setup sssd.  I am trying this with the loop below, but I have never used backrefs before.  I am unsure if I am doing it correctly.  I get an error about an invalid group reference.  I wonder if my regexp is wrong?

Code

- name: Update nsswitch.conf
  replace:
    path: /etc/nsswitch.conf
    regexp: "{{item.regexp}}"
    replace: "{{item.replace}}"
  with_items:
    - {regexp: '^passwd.*',
       replace: '\1 sss'}
    - {regexp: '^group.*',
       replace: '\1 sss'}
  notify: restart sssd

Traceback results

The full traceback is:
Traceback (most recent call last):
  File "/tmp/ansible_q0xtoH/ansible_module_replace.py", line 200, in <module>
    main()
  File "/tmp/ansible_q0xtoH/ansible_module_replace.py", line 173, in main
    result = re.subn(mre, params['replace'], contents, 0)
  File "/usr/lib64/python2.6/re.py", line 162, in subn
    return _compile(pattern, 0).subn(repl, string, count)
  File "/usr/lib64/python2.6/re.py", line 278, in filter
    return sre_parse.expand_template(template, match)
  File "/usr/lib64/python2.6/sre_parse.py", line 795, in expand_template
    raise error, "invalid group reference"
sre_constants.error: invalid group reference

failed: [ansibletest-oel6] (item={u'regexp': u'^group.*', u'replace': u'\\1 sss'}) => {
    "failed": true,
    "item": {
        "regexp": "^group.*",
        "replace": "\\1 sss"
    },
    "module_stderr": "Traceback (most recent call last):\n  File \"/tmp/ansible_q0xtoH/ansible_module_replace.py\", line 200, in <module>\n    main()\n  File \"/tmp/ansible_q0xtoH/ansible_module_replace.py\", line 173, in main\n    result = re.subn(mre, params['replace'], contents, 0)\n  File \"/usr/lib64/python2.6/re.py\", line 162, in subn\n    return _compile(pattern, 0).subn(repl, string, count)\n  File \"/usr/lib64/python2.6/re.py\", line 278, in filter\n    return sre_parse.expand_template(template, match)\n  File \"/usr/lib64/python2.6/sre_parse.py\", line 795, in expand_template\n    raise error, \"invalid group reference\"\nsre_constants.error: invalid group reference\n",
    "module_stdout": "",
    "msg": "MODULE FAILURE",
    "rc": 1
}

[Matt Martz]

You haven't actually created a match group in your regex.  I assume you want something like ^(group.*) or something.  The () create the match group.

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Matt Martz
@sivel
sivel.net

[John Harmon]

Perfect.  Thanks Matt!  I am really horrible at regexp.  I totally missed grouping it.  I tested it and it works.  Thanks again.

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