[LeetCode/릿코드] 125. Valid Palindrome

문제

 

 

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풀이

 

 

 

class Solution {
    public boolean isPalindrome(String s) {
        String lower = s.toLowerCase();
 
        String replace = lower.replaceAll("[^a-z0-9]", "");
 
        StringBuilder sb = new StringBuilder(replace);
        String reverse = sb.reverse().toString();
 
        if(replace.equals(reverse)){
            return true;
        }
        return false;
    }
}