matrix-ma1sd/tasks/validate_config.yml: can ansible process regex in when statements?

roles/matrix-ma1sd/tasks/validate_config.yml

@@ -55,3 +55,4 @@
   when: "item.old in vars"
   with_items:
     - {'old': 'matrix_ma1sd_container_expose_port', 'new': '<superseded by matrix_ma1sd_container_http_host_bind_port>'}
+    - {'old': 'matrix_mxisd_.*', 'new': 'matrix_ma1sd_.*'}