LeetCode 831: Masking Personal Information Solution

Master LeetCode problem 831 (Masking Personal Information), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

831. Masking Personal Information

Medium

String

Problem Explanation

Explanation:

We need to mask the personal information string based on whether it represents an email address or a phone number.
For email addresses, we need to convert the name and domain to lowercase and replace the middle characters of the name with asterisks.
For phone numbers, we need to remove separation characters and mask the number accordingly.

Solution Code

class Solution {
    public String maskPII(String s) {
        if (s.contains("@")) {
            return maskEmail(s);
        } else {
            return maskPhoneNumber(s);
        }
    }
    
    private String maskEmail(String email) {
        int atIndex = email.indexOf('@');
        String name = email.substring(0, atIndex).toLowerCase();
        String domain = email.substring(atIndex).toLowerCase();
        return name.charAt(0) + "*****" + name.charAt(name.length() - 1) + domain;
    }
    
    private String maskPhoneNumber(String phone) {
        String digits = phone.replaceAll("\\D", "");
        int localLength = digits.length() - 10;
        String masked = "***-***-" + digits.substring(digits.length() - 4);
        if (localLength > 0) {
            String country = "+";
            for (int i = 0; i < localLength; i++) {
                country += "*";
            }
            return country + "-" + masked;
        }
        return masked;
    }
}

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