Making a string, file-safe (file-encode??)

I was wondering if there was a quick way to ensure that a filename is
a safe.

What I mean is that if I am creating a file from a string variable, I
want to ensure that the file will actually be able to be created. So
if it contains a "?", then clearly I would want to eliminate it.

I know that there is something like URL encode that encodes strings
for use in urls, but is there another function that works similarly
for strings for files that I want to create?

Thanks!
.

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