ip-regex

Regular expression for matching IP addresses

Install

npm install ip-regex

This module targets Node.js 12 or later and the latest version of Chrome, Firefox, and Safari. If you want support for older browsers, use version 2.1.0: npm install ip-regex@2.1.0

Usage

import ipRegex from 'ip-regex';

// Contains an IP address?
ipRegex().test('unicorn 192.168.0.1');
//=> true

// Is an IP address?
ipRegex({exact: true}).test('unicorn 192.168.0.1');
//=> false

ipRegex.v6({exact: true}).test('1:2:3:4:5:6:7:8');
//=> true

'unicorn 192.168.0.1 cake 1:2:3:4:5:6:7:8 rainbow'.match(ipRegex());
//=> ['192.168.0.1', '1:2:3:4:5:6:7:8']

// Contains an IP address?
ipRegex({includeBoundaries: true}).test('192.168.0.2000000000');
//=> false

// Matches an IP address?
'192.168.0.2000000000'.match(ipRegex({includeBoundaries: true}));
//=> null

API

ipRegex(options?)

Returns a regex for matching both IPv4 and IPv6.

ipRegex.v4(options?)

Returns a regex for matching IPv4.

ipRegex.v6(options?)

Returns a regex for matching IPv6.

options

Type: object

exact

Type: boolean
Default: false (Matches any IP address in a string)

Only match an exact string. Useful with RegExp#test() to check if a string is an IP address.

includeBoundaries

Type: boolean
Default: false

Include boundaries in the regex. When true, 192.168.0.2000000000 will report as an invalid IPv4 address. If this option is not set, the mentioned IPv4 address would report as valid (ignoring the trailing zeros).

Important

If you run the regex against untrusted user input in a server context, you should give it a timeout.

I do not consider ReDoS a valid vulnerability for this package. It’s simply not possible to make it fully ReDoS safe. It’s up to the user to set a timeout for the regex if they accept untrusted user input. However, I’m happy to accept pull requests to improve the regex.

Related

• is-ip - Check if a string is an IP address
• is-cidr - Check if a string is an IP address in CIDR notation
• cidr-regex - Regular expression for matching IP addresses in CIDR notation