cidr-regex

Regular expression for matching IP addresses in CIDR notation and bare IP addresses

Usage

$ npm i cidr-regex

import cidrRegex from "cidr-regex";

// Contains a CIDR IP address?
cidrRegex().test("foo 192.168.0.1/24");
//=> true

// Is a CIDR IP address?
cidrRegex({exact: true}).test("foo 192.168.0.1/24");
//=> false

cidrRegex.v6({exact: true}).test("1:2:3:4:5:6:7:8/64");
//=> true

// Extract CIDRs from string
"foo 192.168.0.1/24 bar 1:2:3:4:5:6:7:8/64 baz".match(cidrRegex());
//=> ["192.168.0.1/24", "1:2:3:4:5:6:7:8/64"]

// Is a bare IP address?
cidrRegex({exact: true, prefix: "none"}).test("192.168.0.1");
//=> true

// Is either?
cidrRegex({exact: true, prefix: "optional"}).test("192.168.0.1");
//=> true
cidrRegex({exact: true, prefix: "optional"}).test("192.168.0.1/24");
//=> true

API

All three functions match CIDR notation by default. The prefix option switches them to bare IP addresses or to either.

cidrRegex(options?: CidrRegexOptions)

Returns a regex for matching both IPv4 and IPv6 CIDR IP addresses.

cidrRegex.v4(options?: CidrRegexOptions)

Returns a regex for matching IPv4 CIDR IP addresses.

cidrRegex.v6(options?: CidrRegexOptions)

Returns a regex for matching IPv6 CIDR IP addresses.

CidrRegexOptions

The options object has the following properties:

• exact boolean: Only match an exact string. Useful with RegExp#test() to check if a string is a CIDR IP address. Default: false.
• prefix string: Whether a /prefix must follow the address. "required" matches only CIDR, "optional" matches CIDR and bare IP addresses, "none" matches only bare IP addresses. Default: "required".

Related

• ip-bigint - Convert IPv4 and IPv6 addresses to native BigInt and vice-versa
• ip-regex - Regular expression for matching IP addresses
• is-cidr - Check if a string is an IP address in CIDR notation
• is-ip - Check if a string is an IP address
• cidr-tools - Tools to work with IPv4 and IPv6 CIDR network lists

License

© silverwind, distributed under BSD licence

Based on previous work by Felipe Apostol