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Solution: 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.
Example 1:
Input: sentence = "A man, a plan, a canal, Panama!"
Output: true
Explanation: "amanaplanacanalpanama" is a palindrome.
Example 2:
Input: sentence = "Was it a car or a cat I saw?"
Output: true
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