Use the search string test 
<https://docs.ansible.com/ansible/latest/user_guide/playbooks_tests.html#testing-strings>.

when: ansible_net_hostname is search('(csr|asw)')


You could store the regexp in a variable:

vars:
  regexp: 'csr|asw'

when: ansible_net_hostname is search(regexp)


Or you can construct the regexp from a list in the task.

- ios_config:
  ...
  when: ansible_net_hostname is search(regexp)
  vars:
    regexp: "{{ '|'.join(northregion) }}"

---

Sam

> On Nov 4, 2019, at 01:21, rajthecomputerguy <[email protected]> 
> wrote:
> 
> Hi team,
> 
> I am calling a list that contains multiple strings, How to put condition in 
> when statement to match list of strings that matches ansible_hostname
> 
> below playbook does not work. please help
> 
> ansible_net_hostname: testalpcsr029
> 
> vars:
> 
> northregion: [ 'alp', alt' ]
> 
> 
> playbook:- 
>       name: Configure 
>       ios_config:
>         commands:
>             - "{{ item }}"
>       with_items: "{{ snmp_commands_ap }}"
>       when:
>           - "'csr' in ansible_net_hostname or 'asw' in ansible_net_hostname"
>           - northregion in ansible_net_hostname
> 
> 
> thanks
> 
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