Package g0801_0900.s0831_masking_personal_information

Class Solution

  • public class Solution
extends Object
    831 - Masking Personal Information.

    Medium

    You are given a personal information string s, representing either an email address or a phone number. Return the masked personal information using the below rules.

    Email address:

    An email address is:

    • A name consisting of uppercase and lowercase English letters, followed by
    • The '@' symbol, followed by
    • The domain consisting of uppercase and lowercase English letters with a dot '.' somewhere in the middle (not the first or last character).

    To mask an email:

    • The uppercase letters in the name and domain must be converted to lowercase letters.
    • The middle letters of the name (i.e., all but the first and last letters) must be replaced by 5 asterisks "*****".

    Phone number:

    A phone number is formatted as follows:

    • The phone number contains 10-13 digits.
    • The last 10 digits make up the local number.
    • The remaining 0-3 digits, in the beginning, make up the country code.
    • Separation characters from the set {'+', '-', '(', ')', ' '} separate the above digits in some way.

    To mask a phone number:

    • Remove all separation characters.
    • The masked phone number should have the form:
      • "***-***-XXXX" if the country code has 0 digits.
      • "+*-***-***-XXXX" if the country code has 1 digit.
      • "+**-***-***-XXXX" if the country code has 2 digits.
      • "+***-***-***-XXXX" if the country code has 3 digits.
    • "XXXX" is the last 4 digits of the local number.

    Example 1:

    Input: s = “[email protected]”

    Output: “l*****[email protected]”

    Explanation: s is an email address.

    The name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks.

    Example 2:

    Input: s = “[email protected]”

    Output: “a*****[email protected]”

    Explanation: s is an email address.

    The name and domain are converted to lowercase, and the middle of the name is replaced by 5 asterisks.

    Note that even though “ab” is 2 characters, it still must have 5 asterisks in the middle.

    Example 3:

    Input: s = “1(234)567-890”

    Output: “***-***-7890”

    Explanation: s is a phone number.

    There are 10 digits, so the local number is 10 digits and the country code is 0 digits.

    Thus, the resulting masked number is “***-***-7890”.

    Constraints:

    • s is either a valid email or a phone number.
    • If s is an email:
      • 8 <= s.length <= 40
      • s consists of uppercase and lowercase English letters and exactly one '@' symbol and '.' symbol.
    • If s is a phone number:
      • 10 <= s.length <= 20
      • s consists of digits, spaces, and the symbols '(', ')', '-', and '+'.

    • Constructor Detail

      • Solution

        public Solution()