SyntaxWarning: invalid escape sequence '\s' when compiling RCV_REGEX

[Xelynega]

The following error is given when running the nrf802154_sniffer.py script in Python 3.12.2:

nrf802154_sniffer.py:81: SyntaxWarning: invalid escape sequence '\s'
  RCV_REGEX = 'received:\s+([0-9a-fA-F]+)\s+power:\s+(-?\d+)\s+lqi:\s+(\d+)\s+time:\s+(-?\d+)'

I was able to fix it by escaping all the backslashes, but not sure what the correct fix would be here to maintain version compatibility with the version it was working in previously.

[stig-bjorlykke]

What about changing this line to
RCV_REGEX = r'received:\s+([0-9a-fA-F]+)\s+power:\s+(-?\d+)\s+lqi:\s+(\d+)\s+time:\s+(-?\d+)'