Matches regular expressions in html format!

Find a regular expression that matches the html format !! & Lt; ul & nbsp; & gt; & nbsp; & lt; li & gt; 1 & lt; li & gt; & nbsp; & lt; li & gt; 2 & lt; li & gt; & lt; ul & gt; can I use regular expressions to match such HTML code? I won't write regular expressions. I went to the internet and read some basic tutorials. the matching result is only a regular expression matching the html format !!

 
 

  
  
  
  
  
1
  
  
  
  
  
2
  
  

 
 

Can I use regular expressions to match such HTML code? I won't write regular expressions. I went to the internet and read some basic tutorials. the matching results are only

Inside

No matching (the number of li in it is not fixed. it can be 2 or more ~). Please help write down the regular expression!
------ Solution --------------------

  
$str = 'afdasdfdsa
  
  

   
   
  
   
   
1
   
   
  
   
   
2
   
   

  
  
asdfasdfasd
  
  

   
   
  
   
   
3
   
   
  
   
   
4
   
   

  
  
fdsgsdfg';

preg_match_all('/
  
   ]*>.*<\/ul>/isU', $str, $matches);
   
print_r($matches[0]);
   

   
?>
  

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

  $str = '
  
  

   
   
  
   
   
1
   
   
  
   
   
2
   
   

  
  


  
  

   
   
  
   
   
3
   
   

  
  


  
  

   
   
  
   
   
4
   
   
  
   
   
5
   
   
  
   
   
6
   
   

  
  
';
preg_match_all('/
  
   .*?<\/ul>/s', $str, $matches);
   
var_dump($matches);