Go Regular Expression Guide: How to Match IP Addresses

Go Language Regular Expressions Guide: How to Match IP Addresses

Introduction:
Regular expressions are a powerful tool for matching and searching for specific patterns in strings. In the Go language, you can use the built-inregexppackage to implement regular expression operations. This article will introduce how to use regular expressions in Go language to match IP addresses.

IP address format:
An IP address is an address composed of 32-bit binary numbers, usually represented by four separated decimal numbers. Each decimal number ranges from 0 to 255. For example: 192.168.0.1.

Regular expression to match IP address:
In Go language, you can use regular expressions to match IP addresses. The following is an example of a regular expression that matches an IP address:

^(d{1,3}.){3}d{1,3}$

Explanation:

• ^means matching the beginning of
• dmeans matching numbers
• {1,3}means matching 1 to 3 numbers
• .means matching dots (.)
• {3}means matching the previous expression 3 times
• $means matching the end

Sample code :
The following is a sample code that uses Go language regular expressions to match IP addresses:

package main import ( "fmt" "regexp" ) func main() { ip := "192.168.0.1" match, _ := regexp.MatchString(`^(d{1,3}.){3}d{1,3}$`, ip) if match { fmt.Println("IP地址匹配成功！") } else { fmt.Println("IP地址匹配失败！") } }

Output results:

IP地址匹配成功！

Extensions:
In addition to the above sample code , you can also use other functions of theregexppackage to match IP addresses. Here is a sample code that uses theregexp.FindStringfunction to match IP addresses:

package main import ( "fmt" "regexp" ) func main() { ip := "192.168.0.1" re := regexp.MustCompile(`^(d{1,3}.){3}d{1,3}$`) match := re.FindString(ip) if match != "" { fmt.Printf("匹配到的IP地址是：%s ", match) } else { fmt.Println("未匹配到IP地址！") } }

Output results:

匹配到的IP地址是：192.168.0.1

Summary:
This article introduces how to use Go Language regular expressions to match IP addresses, a simple regular expression example and related code implementation are given. I hope that through the introduction of this article, readers can understand how to use regular expressions to match IP addresses in the Go language.

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