Your regex:
$output =~ s{.*(/)}{$1}
...says to match any number of characters followed by a slash, then replace the whole match with a slash. As a result, if there is a match there is going to be a slash in the output. There's actually no point in even specifying $1 because your substitution is the same as:
s{.*/}{/}
Here are some other solutions:
1.
use strict;
use warnings;
use 5.010;
use File::Basename;
my @paths = (
"y:/home/lib/directory/book",
"y:/home/lib/directory/book_manager",
"y:/home/lib/directory/piano_book",
);
my @results = map basename($_), @paths;
say "@results";
--output:--
book book_manager piano_book
2.
@results = map { (split '/', $_)[-1] } @paths;
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