open(IMGDB, "$img_db"); # Open db for reading
@imgarray=<IMGDB>;
close (IMGDB);

my @matchingOptions = grep{ /\Q$search\E/i }, @imgarray;

foreach my $imgline (@matchingOption) {
    my ($img_name,$img_desc) = split /\|/, $imgline;

print <<End_of_head;
    <option value='$img_name'>$img_desc</option>
End_of_head
  }
}

...

for my $imgline ( @matchingOptions ) {
    # Do things;
}