Update valid-palindrome/togo26.js

Remove unnecessary regex construction

Co-authored-by: polymorph <33543196+dahyeong-yun@users.noreply.github.com>

Author: togo26

valid-palindrome/togo26.js

@@ -12,7 +12,7 @@ var isPalindrome = function (s) {
 // TC: O(n) / SC: O(1)
 // With two pointers
 var isPalindrome = function (s) {
-  const nonAlphanumeric = new RegExp(/[^a-zA-Z0-9]+/);
+  const nonAlphanumeric = /[^a-zA-Z0-9]+/;
   let left = 0;
   let right = s.length - 1;