How to verify IPv4 address using regular expression in golang

In the field of computer network and system management, IP address is a very important concept. Among them, the IPv4 address is the most common one. It consists of four decimal numbers (each number is between 0 and 255), connected by a dot (.) in the middle. In Golang, regular expressions can be easily used to verify the validity of IPv4 addresses.

The method of using regular expressions to verify IPv4 addresses is as follows:

First, we need to use regular expressions to match IPv4 addresses. An IPv4 address consists of 4 numbers, each number between 0 and 255, connected by dots. You can use the following regular expression to match IPv4 addresses:

^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$

The meaning of this regular expression is: match an IPv4 address in a non-capturing grouping manner, divided into four parts, each part consists of one or two numbers consists of each number between 0 and 255.

Next, use this regular expression in Golang to verify the IPv4 address:

package main

import (
    "fmt"
    "regexp"
)

func main() {
    regex := regexp.MustCompile(`^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$`)
    ip := "192.168.0.1"
    if regex.MatchString(ip) {
        fmt.Printf("%s is a valid IPv4 address.
", ip)
    } else {
        fmt.Printf("%s is not a valid IPv4 address.
", ip)
    }
}

In this example, we use the MatchString() function in Golang's regexp package to The regular expression and the IPv4 address to be verified are passed in as parameters to determine whether the IPv4 address to be verified is legal. If true is returned, the IPv4 address is legal; if false is returned, the IPv4 address is illegal.

The above is how to use regular expressions to verify IPv4 addresses in Golang. Regular expressions can be used to verify the legitimacy of IPv4 addresses more quickly and conveniently, which is very practical in computer network and system management.

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