may be he is on windows. As per his script it looks like windows path. I am not sure. he has to tell us.

may be he is on windows

Doesn't matter. All the windows APIs (and thus all of Perl's) accept / as a path separator.

The problem with his use of \\ is that whilst doubling the backslashes works when he constructs the string, when he interpolates it into another string, the double backslash has been reduced to a single backslash, so it gets seen as escaping the next character in the string and disappears completely.

All windows/perl users should be aware and use / in preference to \ for paths, it makes life much easier.

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Hmm - no, interpolation doesn't work the way I interpret your post:

my $backslash= '\\';

print "This is a backslash: ->$backslash<-\n";
print "Two backslashes: ->$backslash$backslash<-\n";
print "Two backslashes and a 't' (not a tab): ->$backslash${backslash}
+t<-\n";
print "One backslash and a 't' (not a tab): ->${backslash}t<-\n";
__END__
This is a backslash: ->\<-
Two backslashes: ->\\<-
Two backslashes and a 't' (not a tab): ->\\t<-
One backslash and a 't' (not a tab): ->\t<-
[download]

So once a backslash has been stored in a variable, interpolating that variable into other values won't trigger escape sequences. eval will do, and using that string within regular expressions (without quotemeta) will also get the value interpreted anew, evaluating escape sequences.

Still, from a viewpoint of compatibility, as long as you don't have to pass the filenames to outside programs, using forward slash instead of backslash is still preferrable.