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my $str = "This string is not that long
but I break it anyway becauase
...
do it this way. But remember, there will be
newlines inserted between
lines";

my $str = "This string is not that long" .
          " but I break it anyway becauase" .
...
          " unless I say it explicitly," .
          " like\n" .
          " this";

my $str = <<EOF;
This string is not that long
...
newlines inserted between
lines. I can also put $some ($variables) here.
EOF