isPalindrome.js

String.prototype.isPalindrome = function() {
	let specialChars = /[`~!@#$%^&*()_|+\-=?;’—:'",.<>\{\}\[\]\\\/]/gi;
	let prepped = this.replace(specialChars, '').replace(/\s/g, '').toLowerCase();
	return ( prepped === prepped.split('').reverse().join('') )
};

console.log("Matam", "Matam".isPalindrome()); // true
console.log("racecar", "racecar".isPalindrome()); // true
console.log("race car", "race car".isPalindrome()); // true

let longPal = 'Are we not pure? "No, sir!" Panama’s moody Noriega brags. "It is garbage!" Irony dooms a man—a prisoner up to new era.';
console.log(longPal.isPalindrome());