Passing RegEx into node (get entities or current state)

Third party integrations Node-RED
1

I was wondering, is it possible to pass a (variable) (part of ) regEx into another node.
In the node below I’m using a regEx to find all groups, belonging to a specific area, in this case "woonkmr (with state == “on”)

[{"id":"41a6f55123e3d0f6","type":"ha-get-entities","z":"593fb70375108267","name":"","server":"2fba4297.e4145e","version":0,"rules":[{"property":"entity_id","logic":"is","value":"group...*woonkmr_.*","valueType":"re"},{"property":"state","logic":"is","value":"on","valueType":"str"}],"output_type":"split","output_empty_results":false,"output_location_type":"msg","output_location":"payload","output_results_count":1,"x":590,"y":400,"wires":[["53f6565f375405fe"]]},{"id":"2fba4297.e4145e","type":"server","name":"Home Assistant BasAdmin","version":5,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":false,"cacheJson":true,"heartbeat":true,"heartbeatInterval":"30","areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"at: ","statusYear":"hidden","statusMonth":"short","statusDay":"numeric","statusHourCycle":"h23","statusTimeFormat":"h:m","enableGlobalContextStore":true}]

In order to have a more flexible flow I would like to be able to pass the area part (“woonkmr”) as a variable for the get entities node.
The whole flow is driven by a helper (presence) for a specific area, when it changes (to off) it triggers a routine to switch off lights and in the end all devices in the area. But I want this only to happen when lights and such are on in that area in the first place…

[{"id":"41a6f55123e3d0f6","type":"ha-get-entities","z":"593fb70375108267","name":"","server":"2fba4297.e4145e","version":0,"rules":[{"property":"entity_id","logic":"is","value":"group...*woonkmr_.*","valueType":"re"},{"property":"state","logic":"is","value":"on","valueType":"str"}],"output_type":"split","output_empty_results":false,"output_location_type":"msg","output_location":"payload","output_results_count":1,"x":590,"y":400,"wires":[["53f6565f375405fe"]]},{"id":"2fba4297.e4145e","type":"server","name":"Home Assistant BasAdmin","version":5,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":false,"cacheJson":true,"heartbeat":true,"heartbeatInterval":"30","areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"at: ","statusYear":"hidden","statusMonth":"short","statusDay":"numeric","statusHourCycle":"h23","statusTimeFormat":"h:m","enableGlobalContextStore":true}]

Above is the work around, but I was just wondering

2

Yes but not in the node config. You can pass in an array of rules as input as per the doc. So use a change node to set the payload with a jsonata expression to something like this before the get entities node:

{
  "rules": [
    {
      "property": "entity_id",
      "logic": "is",
      "valueType": "regular expression",
      "value": ".*" & field_with_area_from_msg & ".*"
    },
    {
      "property": "state",
      "logic": "is",
      "valueType": "string",
      "value": "on"
    }
  ]
}

Believe that should work. Haven’t really tried to set rules for a get entities node from input before myself but the doc says it is supported so it should work.

3

Worked! (just had to change “regular expression” into “re” and “string” to “str”)

Thanks!
Below is the result

[{"id":"9d28417466b85a87","type":"ha-get-entities","z":"593fb70375108267","name":"Entities","server":"2fba4297.e4145e","version":0,"rules":[{"property":"entity_id","logic":"is","value":"payload","valueType":"msg"},{"property":"state","logic":"is","value":"on","valueType":"str"}],"output_type":"split","output_empty_results":false,"output_location_type":"msg","output_location":"payload","output_results_count":"10","x":420,"y":340,"wires":[["c6ec0c45751e0333"]]},{"id":"5ad07fd4696667bb","type":"change","z":"593fb70375108267","name":"RegEx as Payload","rules":[{"t":"set","p":"payload","pt":"msg","to":"{\t  \"rules\": [\t    {\t      \"property\": \"entity_id\",\t      \"logic\": \"is\",\t      \"valueType\": \"re\",\t      \"value\": \"^light.\"  & $substringBefore($substringAfter(target, \"group.\"), \"_all\") & \".*\"\t    },\t    {\t      \"property\": \"state\",\t      \"logic\": \"is\",\t      \"valueType\": \"str\",\t      \"value\": \"on\"\t    }\t  ]\t}","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":250,"y":340,"wires":[["9d28417466b85a87"]]},{"id":"2fba4297.e4145e","type":"server","name":"Home Assistant BasAdmin","version":5,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":false,"cacheJson":true,"heartbeat":true,"heartbeatInterval":"30","areaSelector":"friendlyName","deviceSelector":"friendlyName","entitySelector":"friendlyName","statusSeparator":"at: ","statusYear":"hidden","statusMonth":"short","statusDay":"numeric","statusHourCycle":"h23","statusTimeFormat":"h:m","enableGlobalContextStore":true}]
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