There is an error in your code. See perldoc perlop
A single-quoted, literal string. A backslash represents a
backslash unless followed by the delimiter or another backslash,
in which case the delimiter or backslash is interpolated.
So '\' don't is what you expect. You have to write '\\' instead.
Yeah, it's tricky. Note that
is the same as
You can use q;\\; if you want to obfuscate more.
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