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  1. or download this
    $file =~ s/(\w{2})(\d+)/$1 . lc($1) . $2 . lc("yy")/e;
  2. or download this
    $file =~ s/(\w{2})\d+/$1 . lc($1) . "yy"/e;
  3. or download this
      $file =~ s/(\w{2})\d+/\L$1yy/;