Python String replace based on chars NOT in RegEx

Question

Is it possible to create a reqex that finds characters that are NOT is a specific set?

Rather than Blacklisting a bunch of characters and replacing them, it would be eas

Answer 1

Try with:

re.sub(r'[^a-zA-Z0-9]', "_", filename)

Answer 2

Yes, use the ^ negation "modifier": r'[^.a-zA-Z0-9]'

Answer 3

clean_filename = re.sub(r'[^.a-zA-Z0-9]', "_", filename)