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+# cidr-regex
+[![](https://img.shields.io/npm/v/cidr-regex.svg?style=flat)](https://www.npmjs.org/package/cidr-regex) [![](https://img.shields.io/npm/dm/cidr-regex.svg)](https://www.npmjs.org/package/cidr-regex) [![](https://api.travis-ci.org/silverwind/cidr-regex.svg?style=flat)](https://travis-ci.org/silverwind/cidr-regex)
+
+> Regular expression for matching IP addresses in CIDR notation
+
+## Install
+
+```sh
+$ npm install --save cidr-regex
+```
+
+## Usage
+
+```js
+const cidrRegex = require('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
+
+'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']
+```
+
+## API
+
+### cidrRegex([options])
+
+Returns a regex for matching both IPv4 and IPv6 CIDR IP addresses.
+
+### cidrRegex.v4([options])
+
+Returns a regex for matching IPv4 CIDR IP addresses.
+
+### cidrRegex.v6([options])
+
+Returns a regex for matching IPv6 CIDR IP addresses.
+
+#### options.exact
+
+Type: `boolean`<br>
+Default: `false` *(Matches any CIDR IP address in a string)*
+
+Only match an exact string. Useful with `RegExp#test()` to check if a string is a CIDR IP address.
+
+
+## Related
+
+- [is-cidr](https://github.com/silverwind/is-cidr) - Check if a string is an IP address in CIDR notation
+- [is-ip](https://github.com/sindresorhus/is-ip) - Check if a string is an IP address
+- [ip-regex](https://github.com/sindresorhus/ip-regex) - Regular expression for matching IP addresses
+
+## License
+
+© [silverwind](https://github.com/silverwind), distributed under BSD licence
+
+Based on previous work by [Felipe Apostol](https://github.com/flipjs)