javascript - Questions about regular expressions

<code>       function palindrome(str) {
         return str.replace(/[\W_]/g,'').toLowerCase() === str.replace(/[\W_]/g,'').toLowerCase().split('').reverse().join('');
        }
    
  palindrome("0_0 (: /-\ :) 0-0");
</code>

Why W does not match underscore_ Doesn’t
W match non-text and numbers?

Reply content:

<code>       function palindrome(str) {
         return str.replace(/[\W_]/g,'').toLowerCase() === str.replace(/[\W_]/g,'').toLowerCase().split('').reverse().join('');
        }
    
  palindrome("0_0 (: /-\ :) 0-0");
</code>

Why W does not match underscore_ Doesn’t
W match non-text and numbers?

First of all, w matches numbers and letters underline: [0-9a-zA-Z_], W is the negation of w, that is, does not match numbers and letters underline