Let's write some regular expressions!

Your task is to create a regular expression matching a valid temperature represented either in Celsius or Fahrenheit scale (e.g. '+23.5 C', '-4 F', '0.0 C', '73.45 F') and to extract all the appearances from the given string text. Positive temperatures can be with or without the + prefix (e.g. '5 F', '+5 F'). Negative temperatures must be prefixed with -. Zero temperature can be used with a prefix or without.

The re module is already imported.

Tips:

The + symbol within the square brackets [] matches the + symbol itself (e.g. the regular expression [1a+] matches to '1', 'a', or '+').
You can also apply ? to the characters within the square brackets [] to make the set optional (e.g. [ab]? matches to 'a', 'b', or '').

What are common ways to manipulate strings?

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