Avoids env var warning when path contains $/%; fix #832 #961
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I ran into the same issue as @kamadoatfluid in #832, as I have a mounted disk path including a
$
(valid file & folder character in most operating systems, as is%
). Since this is intended to catch environment variables per #662, I propose the use of regex instead to prevent irrelevant warnings from cluttering logs/console output.This PR supports all expansion conventions demonstrated in
os.path.expandvars
, and also aligns with environment variable naming specifications. Illegal variables simply will cause errors and therefore don't present a security risk: word characters only, beginning witha-z
or_
.Supported formats:
% APPDATA %
or%APPDATA%
$MYVAR
${MYVAR}