Leetcode: Defanging an IP Address

Defanging an IP Address

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Similar Problems:

Given a valid (IPv4) IP address, return a defanged version of that IP address.

A defanged IP address replaces every period “.” with “[.]”.

Example 1:

Input: address = ""
Output: "1[.]1[.]1[.]1"

Example 2:

Input: address = ""
Output: "255[.]100[.]50[.]0"


  • The given address is a valid IPv4 address.

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

  • Solution:
// Blog link: https://code.dennyzhang.com/example
// Basic Ideas: string
// Complexity: Time O(n), Space O(n)
import "strings"
func defangIPaddr(address string) string {
    return strings.Replace(address, ".", "[.]", -1)

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