How does this simple function that involves the regular

How does this simple function that involves the regularization be implemented?
Judge a string (the string can contain only the following three characters)
1.26 Letters of English
2. "0,1,2,3,4,5,6,7,8,9" 10 digits
3. "-" (conjunction number in English)

------Solution--------------------
$str = "/[^0-9a-za-z]/i";
------Solution--------------------
The Khan Lou lied about the "-" drop.
$str = "/[^0-9a-za-z_]/i";
------Solution--------------------
The upstairs is wrong.
If the judgment does not exist, then '-' does this not count?

I decorate, what need a-za-z?

/^[a-z0-9-]+$/i
------Solution--------------------

PHP Code

preg_match ('/[-a-z0-9]+/i ', $str);//$STR is the string you want to match 
------ Solution--------------------
 
   
   

    
     PHP code 
    
    
 
------Solution--------------------
 
      
       discusses  
      
 PHP code 
      
 Preg_match ('/[-a- Z0-9]+/i ', $str); $str is the string you want to match 
      
 
      
------Solution--------------------
 
      
       Discussion 
    br> 
      
 Reference: 
      
 
      
 PHP code 
      
!--? php
      
 $str = "jsd-fowfmf564c-s1f23";
    
      
 $pattern = '/^[a-z0-9-]+$/i ';//used Upstairs upstairs 
      
 Preg_match ($pattern, $str, $result);
    
      
 if ($result) 
      
 {
      
 echo "matches";
    
      
};
    How is 
      
?> 
      
 implemented with JS? 
      
 
      
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