Valid Palindrome
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"amanaplanacanalpanama" is a palindrome.
Example 2
Input
s = "race a car"Output
false"raceacar" is not a palindrome.
Constraints
- 1 <= s.length <= 2 * 10^5
- s consists only of printable ASCII characters.