Finding json attribute by wildard with jq-CodePudding

I am trying to find a way to extract JSON attributes using wildcard selection with jq. Is there any way to do it? I have the following JSON file. The fields can be dynamic for each system. I want to map Core with its "input" temperature (tempX_input).

    {
      "Core 0":{
         "temp2_input": 52.000,
         "temp2_max": 100.000,
         "temp2_crit": 100.000,
         "temp2_crit_alarm": 0.000
      },
      "Core 1":{
         "temp3_input": 53.000,
         "temp3_max": 100.000,
         "temp3_crit": 100.000,
         "temp3_crit_alarm": 0.000
      }
}

Result:

{
"Core 0": 52.000,
"Core 1": 53.000
}

CodePudding user response：

You could use:

with_entries(.value |= (with_entries(select(.key | endswith("_input"))) | to_entries[].value ))

Using with_enries so we can get the desired keys using endswith("_input")

The above will generate:

{
  "Core 0": 52,
  "Core 1": 53
}

As you can test in this online demo

CodePudding user response：

Using regular expression :

jq 'map_values(
        to_entries[] |
        select(.key |
                test("temp[[:digit:]] _input")).value
    )' input.json