You should run your playbook in check mode until you're certain that your 
regular expression is precise.

On Tuesday, February 13, 2018 at 10:45:57 AM UTC-6, Nico Sabbi wrote:
> HI,
> I need to do a grep-like search in a file without using shell commands and 
> in a check_mode compatible way.
> I just need to check  the presence of a given string a in a file without 
> doing overwrites of any kind.
> I implemented something with lineinfile but I'm very annoyed by the need 
> to  specify the line parameter to overwrite the file
> because the r.e. may be wrong.
> Is there any cleaner way to do what I need?
> - name: grub
>   become: true
>   lineinfile:
>     path: /etc/myfile
>     backrefs: yes 
>     regexp: "^CMDLINE (.*)"
>     line: 'CMDLINE \1'
>     state: present
>   register: myxx
> Thanks.

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