challange-125.js

// problem
// A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.
// Given a string s, return true if it is a palindrome, or false otherwise. 

// Example 1:
// Input: s = "A man, a plan, a canal: Panama"
// Output: true
// Explanation: "amanaplanacanalpanama" is a palindrome.

// solution
var isPalindrome = function(s) {
    const nonAlphanumericStr = s.replace(/[\s+:,.?!_@#$&=+'"|\-\[\]{;}()`%^]/g, "");
    return nonAlphanumericStr.toLowerCase() == nonAlphanumericStr.split('').reverse().join('').toLowerCase()
};