Leetcode - 125. Valid Palindrome
Problem statement: 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 . Solution: Problem says, First convert all uppercase letters into lowercase letters. Remove all non-alphanumeric characters. For first part, I will use ToLower() method of string class. this method will convert all the uppercase letters into lowercase letters. For the second part, I will use Regex Replace method to remove all non-alphanumeric characters. public bool IsPalindrome(string s) { /*here i am checking if string is null or empty if so then it will be always Palindrome so return true*/ if(string.IsNullOrEmpty(s)) return true; /*in this statement i am first c