There are multiple ways you can do this. You might want to investigate using HTML::Template and friends instead of embedding your HTML inside your code. If you still want to embed your HTML inside your code one way to embed your for loop is to use two print statements instead of one. The first prints everything up to and just shy of what the for loop is doing and the other everything after the for loop.

sub buildHTML {
my $html = <<!firsthalf 
something
something
!firsthalf
 foreach my $iter(@whatever) {
      $html = sprintf "%s %s",$html, $something else;
 }
my $html2 =<<!secondhalf;
other stuff
!secnodhalf

 return $html . $html2
}
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