Regex for IPv4 Address

Use this when you need to validate dotted IPv4 literals and reject octets outside the 0-255 range.

Regex

/^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$/

Try this pattern

Matches current input

Test text

192.168.1.10

1 match found in the current text.

JavaScript

const regex = /^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$/g;
regex.test(input);

Python

import re
pattern = re.compile(r"^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$")
bool(pattern.search(input))

re := regexp.MustCompile("^(?:25[0-5]|2[0-4]\\d|1?\\d?\\d)(?:\\.(?:25[0-5]|2[0-4]\\d|1?\\d?\\d)){3}$")
matched := re.MatchString(input)