Configure value_template for 2-line-sensor output without delimiters

Configuration
1

Hi there, I have the following output from my esp8266 sensor with DHT11:

Humidity: 55.00%\n
Temperature: 19.00°C

This is my current config in configuration.yaml, but it seems that I can not access the digits by index?

mqtt:
  sensor:
    - name: "Temperatur"
      unique_id: sensor_esp8266_c
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall("\d{2}")[2] }}'
      unit_of_measurement: "°C"
      availability_topic: "sensor/esp8266/LWT"
    - name: "Luftfeuchtigkeit"
      unique_id: sensor_esp8266_p
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall("\d{2}")[0] }}'
      unit_of_measurement: "%"
      availability_topic: "sensor/esp8266/LWT"

Maybe someone can help my. I also tried different other methods, but with no effect. Thx

Edit: (also tried this)

mqtt:
  sensor:
    - name: "Temperatur"
      unique_id: sensor_esp8266_c
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall_index("(\d+\.?\d+)", index=1) }}'
      unit_of_measurement: "°C"
      availability_topic: "sensor/esp8266/LWT"
    - name: "Luftfeuchtigkeit"
      unique_id: sensor_esp8266_p
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall_index("\\d{2}", index=1) }}'
      unit_of_measurement: "%"
      availability_topic: "sensor/esp8266/LWT"
2

This is my solution:

mqtt:
  sensor:
    - name: "Temperatur"
      unique_id: sensor_esp8266_c
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall_index(find="\d+\.?\d+", index=1, ignorecase=False)|float(0)}}'
      unit_of_measurement: "°C"
    - name: "Luftfeuchtigkeit"
      unique_id: sensor_esp8266_p
      state_topic: "sensor/esp8266"
      value_template: '{{ value|regex_findall_index(find="\d+\.?\d+", index=0, ignorecase=False)|float(0)}}'
      unit_of_measurement: "%"