Regular matching nested div, PHP implementation

Regular Expression Matching nested div, evaluate PHP implementation ~ The following html string: $ str & nbsp; & lt; div & nbsp; & gt; & nbsp; & lt; div & nbsp; & gt; 1111111111 & lt; div & gt; & nbsp; & regular match nested p, evaluate PHP implementation ~
The following html string:
$ Str ='

1111111111

2222222222

Link1

1111111111

2222222222

';
Results to be matched:
Set

The content in is matched:
1 =>

1111111111

2222222222

Link1

2 =>

1111111111

2222222222

Php program implementation, online, etc ~

------ Solution --------------------
Reference:

$ Patten = '/(

(*)

)/';
Preg_match_all ($ patten, $ str, $ match );

It's not that simple, because there will be multiple

, You should start from the inner layer, and then layer by layer to know that

So Far
------ Solution --------------------

 $ Str ='

    
1111111111

    
2222222222

Link1


     
1111111111

     
     
2222222222

';
If (preg_match_all ('#
 
  
] *> (?> [^
  
] +
  
------ Solution --------------------
  
. +?
  
------ Solution --------------------
  

  
------ Solution --------------------
  
(? R ))*)
  
# Is ', $ str, $ matches )){
  
Print_r ($ matches );
  
}
  
?>