Description
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. Given a string s, return true if it is a palindrome, or false otherwise.
Examples
Input:
s = "A man, a plan, a canal: Panama"Output:
trueExplanation:
After processing, it becomes 'amanaplanacanalpanama', which is a palindrome.
Input:
s = "race a car"Output:
falseExplanation:
After processing, it becomes 'raceacar', which is not a palindrome.
Input:
s = " "Output:
trueExplanation:
After removing non-alphanumeric characters, s becomes an empty string which is a palindrome.
Constraints
- •
1 ≤ s.length ≤ 2 × 10⁵ - •
s consists only of printable ASCII characters.