Ansible task continuation only when find strings in registred variable - ansible

Question

I have Ansible code below
- name: Try to delete file
shell: rm -rf /tmp/"{{ file_Del }}"
register: result
ignore_errors: True
- name: Display result
debug:
var: result.stdout
result.stdout can be either
"result.stderr": "Error from server (NotFound): file /tmp/somefile not found"
OR
"result.stderr": "" <= in success
Both of these are valid but I want to fail Ansible of anything else in the "result.stderr". Ex: "result.stderr": "rm -rf Command not found"
How do I do that with "end_play"
- meta: end_play
when: "*Error from server (NotFound): file.*.*not found" not in result.stderr OR result.stderr ==""

Answer 1

When looking at this question it looks like you're working in a bit of a mess, and trying to continue in that way. I think it's best to not move further in that direction, but rather work in a more professional fashion.
For now; a more elegant solution, with only using Ansible modules;
---
- hosts: local_test
# gather_facts: False
vars:
file_Del: test
tasks:
- name: find some files at a location, recursively
find:
paths: "/tmp/{{ file_Del }}"
recurse: true
register: found_files
- name: display files found, to be deleted, could be empty
debug:
msg: "Files found are {{ item.path }}"
with_items:
- "{{ found_files.files }}"
- name: delete files when found
file:
path: "{{ item.path }}"
state: absent
with_items: "{{ found_files.files | default ([]) }}"
- name: display files found, to be deleted, could be empty
debug:
msg: "{{ found_files }}"
- name: end play when no files are found
meta: end_play
when: found_files.matched == 0
- name: this task is skipped when there are no files found, but executed when files were deleted
shell: echo hi
Regarding your matter with "rm -rf Command not found"; this looks just out of the ordinary, e.g. you're executing a playbook on both a Linux and a Windows host, where the task would fail on a Windows host. Each Linux host I know of is pre-installed with rm, even most Docker containers and OpenBSD hosts.
It could be wise to separate these tasks per environment.
Perhaps a bit of context could help us, and eventually you, out.

Answer 2

rm isn't very chatty. See rm -rf return codes. But it's possible to use find and xargs. For example the play
- hosts: localhost
vars:
file_del: xxx
tasks:
- shell: "find /tmp/{{ file_del }} | xargs /bin/rm"
ignore_errors: True
register: result
- meta: end_play
when: result.rc == 123
- debug:
msg: /tmp/{{ file_del }} found and deleted. Continue play.
gives (when /tmp/{{ file_del }} found and deleted)
"msg": "/tmp/xxx found and deleted. Continue play."
and ends the play when file not found result.rc == 123.
Notes
Make sure rc 123 is reported when file not found
It's possible to test result.stderr
If possible write a custom command. For example
$ cat my_custom_command.sh
#!/bin/sh
if [ "$#" -eq "0" ]; then
echo "[ERR 123] No files found.";
exit 123;
fi
echo "Here I can do whatever I want with $#";
exit 0;