SyntaxFix

[linux] Run an Ansible task only when the variable contains a specific string

This example uses regex_search to perform a substring search. 

- name: make conditional variable
  command: "file -s /dev/xvdf"
  register: fsm_out

- name: makefs
  command: touch "/tmp/condition_satisfied"
  when: fsm_out.stdout | regex_search(' data')

ansible version: 2.4.3.0

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