path: root/gemfeed/2024-07-05-random-weird-things.gmi

# Random Weird Things - Part Ⅰ

> Published at 2024-07-05T10:59:59+03:00; Updated at 2025-02-08

Every so often, I come across random, weird, and unexpected things on the internet. I thought it would be neat to share them here from time to time. As a start, here are ten of them.

=> ./2024-07-05-random-weird-things.gmi 2024-07-05 Random Weird Things - Part Ⅰ (You are currently reading this)
=> ./2025-02-08-random-weird-things-ii.gmi 2025-02-08 Random Weird Things - Part Ⅱ
=> ./2025-08-15-random-weird-things-iii.gmi 2025-08-15 Random Weird Things - Part Ⅲ

```
		       /\_/\
WHOA!! 	     ( o.o )
		       > ^ <
		      /  -  \
		    /        \
		   /______\  \
```

## Table of Contents

* ⇢ Random Weird Things - Part Ⅰ
* ⇢ ⇢ 1. `bad.horse` traceroute
* ⇢ ⇢ 2. ASCII cinema
* ⇢ ⇢ 3. Netflix's Hello World application
* ⇢ ⇢ C programming
* ⇢ ⇢ ⇢ 4. Indexing an array
* ⇢ ⇢ ⇢ 5. Variables with prefix `$`
* ⇢ ⇢ 6. Object oriented shell scripts using `ksh`
* ⇢ ⇢ 7. This works in Go
* ⇢ ⇢ 8. "I am a Teapot" HTTP response code
* ⇢ ⇢ 9. `jq` is a functional programming language
* ⇢ ⇢ 10. Regular expression to verify email addresses

## 1. `bad.horse` traceroute

Run traceroute to get the poem (or song).

> Update: A reader hinted that by specifying `-n 60`, there will be even more output!

```bash
❯ traceroute -m 60 bad.horse
traceroute to bad.horse (162.252.205.157), 60 hops max, 60 byte packets
 1  _gateway (192.168.1.1)  5.237 ms  5.264 ms  6.009 ms
 2  77-85-0-2.ip.btc-net.bg (77.85.0.2)  8.753 ms  7.112 ms  8.336 ms
 3  212-39-69-103.ip.btc-net.bg (212.39.69.103)  9.434 ms  9.268 ms  9.986 ms
 4  * * *
 5  xe-1-2-0.mpr1.fra4.de.above.net (80.81.194.26)  39.812 ms  39.030 ms  39.772 ms
 6  * ae12.cs1.fra6.de.eth.zayo.com (64.125.26.172)  123.576 ms *
 7  * * *
 8  * * *
 9  ae10.cr1.lhr15.uk.eth.zayo.com (64.125.29.17)  119.097 ms  119.478 ms  120.767 ms
10  ae2.cr1.lhr11.uk.zip.zayo.com (64.125.24.140)  120.398 ms  121.147 ms  120.948 ms
11  * * *
12  ae25.mpr1.yyz1.ca.zip.zayo.com (64.125.23.117)  145.072 ms *  181.773 ms
13  ae5.mpr1.tor3.ca.zip.zayo.com (64.125.23.118)  168.239 ms  168.158 ms  168.137 ms
14  64.124.217.237.IDIA-265104-ZYO.zip.zayo.com (64.124.217.237)  168.026 ms  167.999 ms  165.451 ms
15  * * *
16  t00.toroc1.on.ca.sn11.net (162.252.204.2)  131.598 ms  131.308 ms  131.482 ms
17  bad.horse (162.252.205.130)  131.430 ms  145.914 ms  130.514 ms
18  bad.horse (162.252.205.131)  136.634 ms  145.295 ms  135.631 ms
19  bad.horse (162.252.205.132)  139.158 ms  148.363 ms  138.934 ms
20  bad.horse (162.252.205.133)  145.395 ms  148.054 ms  147.140 ms
21  he.rides.across.the.nation (162.252.205.134)  149.687 ms  147.731 ms  150.135 ms
22  the.thoroughbred.of.sin (162.252.205.135)  156.644 ms  155.155 ms  156.447 ms
23  he.got.the.application (162.252.205.136)  161.187 ms  162.318 ms  162.674 ms
24  that.you.just.sent.in (162.252.205.137)  166.763 ms  166.675 ms  164.243 ms
25  it.needs.evaluation (162.252.205.138)  172.073 ms  171.919 ms  171.390 ms
26  so.let.the.games.begin (162.252.205.139)  175.386 ms  174.180 ms  175.965 ms
27  a.heinous.crime (162.252.205.140)  180.857 ms  180.766 ms  180.192 ms
28  a.show.of.force (162.252.205.141)  187.942 ms  186.669 ms  186.986 ms
29  a.murder.would.be.nice.of.course (162.252.205.142)  191.349 ms  191.939 ms  190.740 ms
30  bad.horse (162.252.205.143)  195.425 ms  195.716 ms  196.186 ms
31  bad.horse (162.252.205.144)  199.238 ms  200.620 ms  200.318 ms
32  bad.horse (162.252.205.145)  207.554 ms  206.729 ms  205.201 ms
33  he-s.bad (162.252.205.146)  211.087 ms  211.649 ms  211.712 ms
34  the.evil.league.of.evil (162.252.205.147)  212.657 ms  216.777 ms  216.589 ms
35  is.watching.so.beware (162.252.205.148)  220.911 ms  220.326 ms  221.961 ms
36  the.grade.that.you.receive (162.252.205.149)  225.384 ms  225.696 ms  225.640 ms
37  will.be.your.last.we.swear (162.252.205.150)  232.312 ms  230.989 ms  230.919 ms
38  so.make.the.bad.horse.gleeful (162.252.205.151)  235.761 ms  235.291 ms  235.585 ms
39  or.he-ll.make.you.his.mare (162.252.205.152)  241.350 ms  239.407 ms  238.394 ms
40  o_o (162.252.205.153)  246.154 ms  247.650 ms  247.110 ms
41  you-re.saddled.up (162.252.205.154)  250.925 ms  250.401 ms  250.619 ms
42  there-s.no.recourse (162.252.205.155)  256.071 ms  251.154 ms  255.340 ms
43  it-s.hi-ho.silver (162.252.205.156)  260.152 ms  261.775 ms  261.544 ms
44  signed.bad.horse (162.252.205.157)  262.430 ms  261.410 ms  261.365 ms
```

## 2. ASCII cinema

Fancy watching Star Wars Episode IV in ASCII? Head to the ASCII cinema:

=> https://asciinema.org/a/569727 

## 3. Netflix's Hello World application

Netflix has got the Hello World application run in production 😱

*  https://www.Netflix.com/helloworld
 
> By the time this is posted, it seems that Netflix has taken it offline... I should have created a screenshot!

## C programming

### 4. Indexing an array

In C, you can index an array like this: `array[i]` (not surprising). But this works as well and is valid C code: `i[array]`, 🤯 It's because after the spec `A[B]` is equivalent to `*(A + B)` and the ordering doesn't matter for the `+` operator. All 3 loops are producing the same output. Would be funny to use `i[array]` in a merge request of some code base on April Fool's day!

```c
#include <stdio.h>

int main(void) {
  int array[5] = { 1, 2, 3, 4, 5 };

  for (int i = 0; i < 5; i++)
    printf("%d\n", array[i]);

  for (int i = 0; i < 5; i++)
    printf("%d\n", i[array]);

  for (int i = 0; i < 5; i++)
    printf("%d\n", *(i + array));
}
```

### 5. Variables with prefix `$`

In C you can prefix variables with `$`! E.g. the following is valid C code 🫠:

```c
#include <stdio.h>

int main(void) {
  int $array[5] = { 1, 2, 3, 4, 5 };

  for (int $i = 0; $i < 5; $i++)
    printf("%d\n", $array[$i]);

  for (int $i = 0; $i < 5; $i++)
    printf("%d\n", $i[$array]);

  for (int $i = 0; $i < 5; $i++)
    printf("%d\n", *($i + $array));
}
```

## 6. Object oriented shell scripts using `ksh`

Experienced software developers are aware that scripting languages like Python, Perl, Ruby, and JavaScript support object-oriented programming (OOP) concepts such as classes and inheritance. However, many might be surprised to learn that the latest version of the Korn shell (Version 93t+) also supports OOP. In ksh93, OOP is implemented using user-defined types:

```ksh
#!/usr/bin/ksh93
 
typeset -T Point_t=(
    integer -h 'x coordinate' x=0
    integer -h 'y coordinate' y=0
    typeset -h 'point color'  color="red"

    function getcolor {
        print -r ${_.color}
    }

    function setcolor {
        _.color=$1
    }

    setxy() {
        _.x=$1; _.y=$2
    }

    getxy() {
        print -r "(${_.x},${_.y})"
    }
)
 
Point_t point
 
echo "Initial coordinates are (${point.x},${point.y}). Color is ${point.color}"
 
point.setxy 5 6
point.setcolor blue
 
echo "New coordinates are ${point.getxy}. Color is ${point.getcolor}"
 
exit 0
```

=> https://blog.fpmurphy.com/2010/05/ksh93-using-types-to-create-object-orientated-scripts.html Using types to create object oriented Korn shell 93 scripts

## 7. This works in Go

There is no pointer arithmetic in Go like in C, but it is still possible to do some brain teasers with pointers 😧:

```go
package main

import "fmt"

func main() {
	var i int
	f := func() *int {
		return &i
	}
	*f()++
	fmt.Println(i)
}
```

=> https://go.dev/play/p/sPRdyDvXefK?__s=mk8u899owb9yurl256gw Go playground

## 8. "I am a Teapot" HTTP response code

Defined in 1998 as one of the IETF's traditional April Fools' jokes (RFC 2324), the Hyper Text Coffee Pot Control Protocol specifies an HTTP status code that is not intended for actual HTTP server implementation. According to the RFC, this code should be returned by teapots when asked to brew coffee. This status code also serves as an Easter egg on some websites, such as Google.com's "I'm a teapot" feature. Occasionally, it is used to respond to a blocked request, even though the more appropriate response would be the 403 Forbidden status code.

=> https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#418

## 9. `jq` is a functional programming language

Many know of `jq`, the handy small tool and swiss army knife for JSON parsing. 

=> https://github.com/jqlang/jq

What many don't know that `jq` is actually a full blown functional programming language `jqlang`, have a look at the language description: 

=> https://github.com/jqlang/jq/wiki/jq-Language-Description

As a matter of fact, the language is so powerful, that there exists an implementation of `jq` in `jq` itself:

=> https://github.com/wader/jqjq

Here some snipped from `jqjq`, to get a feel of `jqlang`:

```
def _token:
	def _re($re; f):
	  ( . as {$remain, $string_stack}
	  | $remain
	  | match($re; "m").string
	  | f as $token
	  | { result: ($token | del(.string_stack))
	    , remain: $remain[length:]
	    , string_stack:
	        ( if $token.string_stack == null then $string_stack
	          else $token.string_stack
	          end
	        )
	    }
	  );
	if .remain == "" then empty
	else
	  ( . as {$string_stack}
	  | _re("^\\s+"; {whitespace: .})
	  // _re("^#[^\n]*"; {comment: .})
	  // _re("^\\.[_a-zA-Z][_a-zA-Z0-9]*"; {index: .[1:]})
	  // _re("^[_a-zA-Z][_a-zA-Z0-9]*"; {ident: .})
	  // _re("^@[_a-zA-Z][_a-zA-Z0-9]*"; {at_ident: .})
	  // _re("^\\$[_a-zA-Z][_a-zA-Z0-9]*"; {binding: .})
	  # 1.23, .123, 123e2, 1.23e2, 123E2, 1.23e+2, 1.23E-2 or 123
	  // _re("^(?:[0-9]*\\.[0-9]+|[0-9]+)(?:[eE][-\\+]?[0-9]+)?"; {number: .})
	  // _re("^\"(?:[^\"\\\\]|\\\\.)*?\\\\\\(";
	      ( .[1:-2]
	      | _unescape
	      | {string_start: ., string_stack: ($string_stack+["\\("])}
	      )
	    )
	 .
	 .
	 .
```

## 10. Regular expression to verify email addresses

This is a pretty old meme, but still worth posting here (as some may be unaware). The RFC822 Perl regex to validate email addresses is 😱:

```
(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
)+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:
\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(
?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ 
\t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\0
31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\
](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+
(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:
(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)
?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\
r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[
 \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)
?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t]
)*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[
 \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*
)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
)+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)
*:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+
|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r
\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:
\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t
]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031
]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](
?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?
:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?
:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?
:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?
[ \t]))*"(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] 
\000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|
\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>
@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"
(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t]
)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?
:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[
\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-
\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(
?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;
:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([
^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\"
.\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\
]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\
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00-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\
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;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?
:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*
(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".
\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[
^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]
]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)(?:,\s*(
?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(
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])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t
])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?
:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|
\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:
[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\
]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)
?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["
()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)
?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>
@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[
 \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,
;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t]
)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?
(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".
\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:
\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\[
"()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])
*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])
+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\
.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(
?:\r\n)?[ \t])*))*)?;\s*)
```

=> https://pdw.ex-parrot.com/Mail-RFC822-Address.html

I hope you had some fun. E-Mail your comments to `paul@nospam.buetow.org` :-)

other related posts are:

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