Actually you don't need the backslash escape for the slash if you use a different character for the delimiter.
use strict;
use warnings;
my $test = 'C:\first\second';
print $test, "\n";
$test =~ tr,\\,/,;
#$test =~ tr [\\] [/];
#$test =~ tr <\\> </>;
#$test =~ tr .\\./.;
print $test, "\n";
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