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Problem · String

Validate IP Address

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Problem statement

Given a string queryIP, return "IPv4" if it is a valid IPv4 address, "IPv6" if it is a valid IPv6 address, or "Neither" otherwise.

IPv4 rules

  • The address contains exactly four decimal segments separated by ..
  • Each segment is an integer from 0 through 255.
  • A segment has no leading zero unless it is exactly 0.
  • Every character in a segment is a decimal digit.

IPv6 rules

  • The address contains exactly eight groups separated by :.
  • Each group contains one to four hexadecimal characters.
  • Hexadecimal letters may be lowercase or uppercase.
  • Leading zeroes are allowed, but an empty group is not.

Function

validIPAddress(queryIP: String) → String

Examples

Example 1

queryIP = "172.16.254.1"return = "IPv4"

The address has four decimal segments, each is in range, and none has an invalid leading zero.

Example 2

queryIP = "2001:0db8:85a3:0:0:8A2E:0370:7334"return = "IPv6"

The address has eight non-empty hexadecimal groups, and every group contains at most four characters.

Example 3

queryIP = "256.256.256.256"return = "Neither"

Every segment is greater than 255, so this is not a valid IPv4 address.

Constraints

  • queryIP is a non-empty string.
  • queryIP contains only English letters, decimal digits, ., and :.

More Postman problems

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public String validIPAddress(String queryIP) {
    // write your code here
}
queryIP"172.16.254.1"
expected"IPv4"
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