Template error Freshtomato temperature

I created three temperature sensors using RESTful Sensor platform. Homeassistant integration | LinksysInfo.org

 - platform: rest
    scan_interval: 60
    name: '5G Temp'
    resource: http://192.168.12.123/status-data.jsx
    method: POST
    payload: _http_id=dfsdnfsdnfsdklfnds
    headers:
      Content-Type: 'text/plain;charset=UTF-8'
      Authorization: 'dfnsdjkfnsd=='
      User-Agent: Home Assistant
    value_template: '{{ value | regex_findall_index("eth2: 5G - (\d+)") | int }}'
    state_class: measurement
    device_class: temperature
    unit_of_measurement: '°C'

But I don’t see any value or update in developer tools>states. I tried it in the template but got an error
UndefinedError: 'value' is undefined


added in configuration.yaml but don’t see any sensors being created.