IPv4 Address Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$/;
const test = "192.168.1.1";
console.log(regex.test(test)); // true

// Extract matches
const matches = test.match(regex);
console.log(matches);

import re

pattern = r'^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$'
test = "192.168.1.1"
match = re.search(pattern, test)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$`)
    fmt.Println(re.MatchString("192.168.1.1")) // true
}

Common Use Cases

Match Examples

About the IPv4 Address Regex

Validates IPv4 addresses ensuring each octet is 0-255. Commonly used in network tools, log analysis, and security applications.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The ipv4 address pattern is classified as intermediate difficulty in the validation category. It works in all major programming languages.

When using this regex, always consider edge cases and test thoroughly with real-world data. Use the interactive tester above to validate the pattern against your specific inputs before deploying to production.

More Validation Patterns