Jinja template extract number from entity name

Configuration
1

I have an automation that is triggered on a state change by many entities:

triggers:
  - trigger: state
    entity_id:
      - event.button_1_action
      - event.button_2_action
      - event.button_3_action
      - event.button_4_action
      - event.button_5_action
      - event.button_6_action
      - event.button_7_action
      - event.button_8_action
actions:
  - variables:
      switch_entity_name: switch.my_output_{{ trigger.entity_id | ... }}

I am looking at a variable trigger.entity_id to get the entity that triggered the automation. And I would like to switch the same output number.

How could I extract the number from the entity name with regex and put it to variable?

2

You can give ID to each trigger, and this id can be just number. In that way, you will avoid messing with string operations in jinja.

3

You could use eight separate triggers with trigger ids, but I get why you’d prefer to just have all the entities listed in one trigger. To get the number from the entity_id of the trigger you can use

{{ trigger.entity_id.split("_")[1] }}
4

That was the easiest, thanks.

You got the point, having many triggers to perform respective actions with outputs with same name, copy/paste is a nightmare for me.

Edit: I found the way with regex_findall and a matching group:

{{ 'event.button_8_action' | regex_findall(find='.*_(\d+)_.*') | first }}

which returns 8 or any other number present.

5

That’s exactly what this does but without the overhead of a regex search.