How to get the regular expression string inverse

How does the regular expression string get reversed?
I have a URL rule as follows:

mm.[*|a|b|add].cn

Where A, B, add represents an exception

For example

Mm.a.cn cannot match

Mm.x.cn can match

How to write the regular???

All I know is mm\. [a|b|add]\.cn can match all exceptions, but I just want a reverse result?]
Regular Expressions Regular URL

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------Solution--------------------

$s 1= ' mm.a.cn ';
$s 2= ' mm.add.cn ';
$s 3= ' mm.c.cn ';
$p = '/mm\. (.+) (?
 
   ------Solution--------------------
B
------Solution--------------------
Add) \.cn/';
$bool 1=preg_match ($p, $s 1);
$bool 2=preg_match ($p, $s 2);
$bool 3=preg_match ($p, $s 3);
Var_dump ($bool 1, $bool 2, $bool 3);

int (0) int (0) int (1)
------Solution--------------------

Preg_match (' #www \. ( A
------Solution--------------------
B
------Solution--------------------
Add) \.cn# ', $str)

If it doesn't match.

!preg_match (' #www \. ( A
------Solution--------------------
B
------Solution--------------------
Add) \.cn# ', $str)

------Solution--------------------
Just say to the LZ--this is hard to write.

References:

$s 1= ' mm.a.cn ';
$s 2= ' mm.add.cn ';
$s 3= ' mm.c.cn ';
$p = '/mm\. (.+) (?
   
     ------Solution--------------------
B
------Solution--------------------
Add) \.cn/';
$bool 1=preg_match ($p, $s 1);
$bool 2=preg_match ($p, $s 2);
$bool 3=preg_match ($p, $s 3);
Var_dump ($bool 1, $bool 2, $bool 3);

int (0) int (0) int (1)

Try mm.aadd.cn?
------Solution--------------------

$s =<<< TXT


mm.aadd.cn
mm.c.cn
TXT;

Preg_match_all ('/mm\. A
------Solution--------------------
B
------Solution--------------------
Add). *?\.cn/s ', $s, $r);
Print_r ($R);
Preg_match_all ('/mm\. A\.
------Solution--------------------
B\.
------Solution--------------------
Add\.). *?\.CN/S ', $s, $r);
Print_r ($R);

Array
(
[0] = = Array
(
[0] = mm.x.cn
[1] = mm.c.cn
)

)
Array
(
[0] = = Array
(
[0] = mm.x.cn
[1] = mm.aadd.cn
[2] = mm.c.cn
)

)

------Solution--------------------
Preg_match_all ('/mm\. A\.
------Solution--------------------
B\.
------Solution--------------------
Add\.). *?\.CN/S ', $s, $r);
Can write
Preg_match_all ('/mm\. (?: A
------Solution--------------------
B
------Solution--------------------
Add) \.). *?\.CN/S ', $s, $r);

------Solution--------------------

preg_match_all ('/mm\. A\.
------Solution--------------------
B\.
------Solution--------------------
add\.). *?\.CN/S ', $s, $r);
can write
Preg_match_all ('/mm\. (?: a
------solution--------------------
B
------Solution--------------------
Add) \.). *?\.CN/S ', $s, $r);

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