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!I!n!s!e!r!t! !i!n!b!e!t!w!e!e!n!

Posted from here.

This challenge is highly "distilled" from this question. Special thanks to @Akababa!

In this task, you should insert an exclamation mark at the start of the string and after every character.

Rules

There will always be a non-empty-string input. The input will not contain tabs either. You can assume that the input only contain non-extended ASCII printable characters and newlines.
The input will not contain trailing newlines as long as your language can't detect a newline.
This is a code-golf contest; the shortest answer should win.

Examples

4 newlines result in 5 newline-delimited exclamation marks. It is very hard to put this as a Markdown text, so this is stated instead.

1 2 3 4 5 6
129591 129012 129127 129582
0

Outputs

!1! !2! !3! !4! !5! !6!
!1!2!9!5!9!1! !1!2!9!0!1!2! !1!2!9!1!2!7! !1!2!9!5!8!2!
!
!0!

asd afjoK ak:e
kPrLd
 fOJOE;
 KFO
KFkepjgop sgpaoj faj

Outputs

!a!s!d! !a!f!j!o!K! !a!k!:!e!
!k!P!r!L!d!
! ! ! ! !f!O!J!O!E!;!
! ! ! ! !K!F!O!
!K!F!k!e!p!j!g!o!p! !s!g!p!a!o!j! ! ! !f!a!j!

A base test case with only one character:

Outputs

!a!

(Auto-completion! Just kidding, there is no such thing.) Contains exclamation marks:

!!
!!
!!
!!
!!

Outputs:

!!!!!
!!!!!
!!!!!
!!!!!
!!!!!

Answer*

If this is an answer to a challenge…

…Be sure to follow the challenge specification. However, please refrain from exploiting obvious loopholes. Answers abusing any of the standard loopholes are considered invalid. If you think a specification is unclear or underspecified, comment on the question instead.
…Try to optimize your score. For instance, answers to code-golf challenges should attempt to be as short as possible. You can always include a readable version of the code in addition to the competitive one. Explanations of your answer make it more interesting to read and are very much encouraged.
…Include a short header which indicates the language(s) of your code and its score, as defined by the challenge.

More generally…

…Please make sure to answer the question and provide sufficient detail.
…Avoid asking for help, clarification or responding to other answers (use comments instead).

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2

\$\begingroup\$ Actually, I created this challenge based on this Retina built-in. \$\endgroup\$

user85052
– user85052

2019年08月18日 11:04:05 +00:00
Commented Aug 18, 2019 at 11:04
\$\begingroup\$ Works in QuadR too. \$\endgroup\$

Adám
– Adám

2019年08月18日 15:01:11 +00:00
Commented Aug 18, 2019 at 15:01
\$\begingroup\$ -1 bytes in QuadR. \$\endgroup\$

user85052
– user85052

2019年08月18日 15:19:08 +00:00
Commented Aug 18, 2019 at 15:19
2

\$\begingroup\$ @A__ Right, I forgot about that feature (If there is only one non-function line...). You may want to re-consider your check-mark. \$\endgroup\$

Adám
– Adám

2019年08月18日 19:02:21 +00:00
Commented Aug 18, 2019 at 19:02

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