Way to format all non whitespace characters from a string?

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#1

Is there a string specifier or other method of changing non whitespace characters? I want to maintain spaces but change other letters.
Example: Black Hole → ????? ????
Thanks!

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#2

The %S specifier:

local str = "Convert everything here (other than whitespaces) to '?'"
str = str:gsub("%S", '?')

print(str) --> Every other than spaces are changed to '?'
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