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

Question 1

I have multiple tasks depend from the value of variable1. I want to check if the value is in {{ variable1 }} but I get an error:

- name: do something when the value in variable1
  command: <command>
  when: "'value' in {{ variable1 }}"

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- name: do something when the value in variable1

command:

when: "'value' in {{ variable1 }}"

I’m using ansible 2.0.2

Question 2

If variable1 is a string, and you are searching for a substring in it, this should work:

when: '"value" in variable1'

1 2	when: '"value" in variable1'

if variable1 is an array or dict instead, in will search for the exact string as one of its items.

Question: