this_line_'aaa|bbb|ccc|ddd|eee'_is_terminated
this_line_'aaa|bbb|ccc|ddd|eee'_is_terminated
this_line_'aaaaa|bbbbb|ccccc|ddddd|eeeee'_is_...
this_line_'aaaaa|bbbbb|ccccc|ddddd|eeeee'_is_...
this_line_'aaaaaa|bbbbbb|cccccc|dddddd|eeeeee...
this_line_'aaaaaa|bbbbbb|cccccc|dddddd|eeeeee...

##</code><code>##

while (<>) {
  $inline = $_;
  ($data,$trail) = $inline =~ /this_line_'(.*)('_|\.\.\.);
  print $data . "\n";
}

##</code><code>##

aaa|bbb|ccc|ddd|eee
aaa|bbb|ccc|ddd|eee
aaaaa|bbbbb|ccccc|ddddd|eeeee'_is_
aaaaa|bbbbb|ccccc|ddddd|eeeee'_is_
aaaaaa|bbbbbb|cccccc|dddddd|eeeeee
aaaaaa|bbbbbb|cccccc|dddddd|eeeeee