Using value_template and regex_search on mqtt 'text' payload

@mykp wrote:

Hi
I am a hassio beginner and have managed to solve most of my basic system challenges with google and the generous advice given by this amazing community (thanks). I am struggling with a mqtt server message coming from an alarm panel where the payload is a text field of variable length: e.g. one or more Zones (ZXX) in every message e.g.

Topic: alarm/problem_report
Payload: Living room (Z15) low batt,
Fire (Z23) low batt,
Upstairs (Z24) low batt

(Each payload line is separated with \r\n).

I am attempting to either write automations triggered by each zone detected (these messages are always low battery), or create binary (battery) sensors to highlight the low battery status for each zone. I only need to find the zone code e.g. Z23.

I have tried many permutations of regex etc. but just can’t seem to get a trigger e.g. (created with the automation tool but copied from automations.yaml).

- id: AlarmPanelTest
  alias: Alarm Panel Test
  trigger:
  - platform: mqtt
    topic: alarm/problem_report
  condition:
  - condition: template
    value_template: '{{value|regex_search("Z15",ignorecase=FALSE) }}'
  action:
  - data:
      message: Living Room PIR - Low Battery
      notification_id: Alarm Panel Problem Z15
      title: Alarm low battery
      service: persistent_notification.create

I have tried single quotes and double single quotes surrounding the Z15 but nothing triggers.

I have also tried: value_template: ‘{{“Z15” in value}}’

The binary sensor looks like this:

  - platform: mqtt
    name: "Living room PIR"
    state_topic: "alarm/problem_report"
    device_class: battery
    value_template: '{{ value|regex_search(''Z15'', ignorecase=FALSE)}}'

It doesn’t change the battery status when the problem report.

I am wondering if I am misunderstanding the use of value_template or whether regex_search is the right tool and if so, what is returned when there is a match and whether it can be used as a condition?

I am also wondering whether I can have multiple automations triggering off the same message (one per zone)?

All thoughts and guidance gratefully appreciated…

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