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Questions about regularity

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-09-23 03:30:071013browse
<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?

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