Valid Palindrome

JUNIOR

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Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

Example:

Input: "A man, a plan, a canal: Panama"
Output: true

Input 1:{"s":"A man, a plan, a canal: Panama"}

Output 1:true

Input 2:{"s":"race a car"}

Output 2:false

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