Variables in conditional

task.yml

- name: Apply the .sql scripts to create the database tables
  postgresql_query:
    db: vendor-{{ item.0.name }}-{{ item.0.cust_num }}
    path_to_script: "{{ item.1.path }}"
  loop: "{{ vendor_sites|product(table_scripts.files)|list }}"
  loop_control:
    label: "{{ item.0.name }}-{{ item.0.cust_num }} - {{ item.1.path|regex_search('[^/]*$') }}"
  when: table-{{ item.0.name }}-{{ item.0.cust_num }}-{{ item.1.path|regex_search('[^/]*$') }} not in db_flag_files.files