$file =~ s/^"(.+)"$/$1/;  # unquote
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The parens in the regex capture text into numbered variables. The first set of parens grab into $1, the second into $2 and so forth. For more info check out perlre.

It may be a bit off topic, but I'd really like to recommend that you pick up a copy of Learning Perl from a bookstore or your local library. It is the best introductory perl material I have seen. You'll be glad you did.