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The extra separator came over from Ethereal - maybe modeled after a sniffer display from that era.

It's not common in other hex dumps like xxd or tcpdump.

It's defined in data_printer.h:

// Insert a space after this many bytes
static int separatorInterval() { return 8; }

Used in byte_view_text.cpp (Packets Bytes):

const int ByteViewText::separator_interval_ = DataPrinter::separatorInterval();

But not in data_printer.cpp (Copy Bytes...).

Seems like since it's a Wireshark format, maybe the formatting should be consistent.
Enhancement requests are opened as issues on gitlab/wireshark

The extra separator came over from Ethereal - maybe modeled after a sniffer display from that era.

It's not common in other hex dumps like xxd or tcpdump.

It's defined in data_printer.h:

// Insert a space after this many bytes
static int separatorInterval() { return 8; }

Used in byte_view_text.cpp (Packets Bytes):

const int ByteViewText::separator_interval_ = DataPrinter::separatorInterval();

But not in data_printer.cpp (Copy Bytes...).

Seems like since it's a Wireshark format, maybe the formatting should be consistent.
Enhancement requests are opened as issues on gitlab/wireshark

EDIT: seems hexdump canonical adds the extra divider/separator.

-C, --canonical
      Canonical hex+ASCII display.  Display the input offset in
      hexadecimal, followed by sixteen space-separated, two-column,
      hexadecimal bytes, followed by the same sixteen bytes in %_p
      format enclosed in '|' characters.  Invoking the program as hd
      implies this option.

$ cat grep.err | hexdump -C | head -5
00000000  67 72 65 70 3a 20 61 63  70 69 3a 20 49 73 20 61  |grep: acpi: Is a|
00000010  20 64 69 72 65 63 74 6f  72 79 0a 67 72 65 70 3a  | directory.grep:|
00000020  20 61 6c 74 65 72 6e 61  74 69 76 65 73 3a 20 49  | alternatives: I|
00000030  73 20 61 20 64 69 72 65  63 74 6f 72 79 0a 67 72  |s a directory.gr|
00000040  65 70 3a 20 61 70 61 63  68 65 32 3a 20 49 73 20  |ep: apache2: Is |

$ cat grep.err | hd | head -5
00000000  67 72 65 70 3a 20 61 63  70 69 3a 20 49 73 20 61  |grep: acpi: Is a|
00000010  20 64 69 72 65 63 74 6f  72 79 0a 67 72 65 70 3a  | directory.grep:|
00000020  20 61 6c 74 65 72 6e 61  74 69 76 65 73 3a 20 49  | alternatives: I|
00000030  73 20 61 20 64 69 72 65  63 74 6f 72 79 0a 67 72  |s a directory.gr|
00000040  65 70 3a 20 61 70 61 63  68 65 32 3a 20 49 73 20  |ep: apache2: Is |