But I don't because I'm pushing each into an array individually, right?

Depends. As long as you can only have one match per line, then yes, the following would do:

while (<>) {
   if (/.../) {
      push @matches, ...;
   }
}
[download]

If you can have multiple matches per line, you'd need something like:

while (<>) {
   while (/.../g) {
      push @matches, ...;
   }
}
[download]

It's moot, however, since you want to match text that span multiple lines. You want something more like the following:

my $file; { local $/; $file = <>; }   # Slurp file.
while ($file =~ /.../g) {
   push @matches, ...;
}
[download]