text: # is-posix-bracket [![NPM version](https://img.shields.io/npm/v/is-posix-bracket.svg?style=flat)](https://www.npmjs.com/package/is-posix-bracket) [![NPM downloads](https://img.shields.io/npm/dm/is-posix-bracket.svg?style=flat)](https://npmjs.org/package/is-posix-bracket) [![Build Status](https://img.shields.io/travis/jonschlinkert/is-posix-bracket.svg?style=flat)](https://travis-ci.org/jonschlinkert/is-posix-bracket)
  
  > Returns true if the given string is a POSIX bracket expression (POSIX character class).
  
  ## Install
  
  Install with [npm](https://www.npmjs.com/):
  
  ```sh
  $ npm install is-posix-bracket --save
  ```
  
  ## Usage
  
  ```js
  var isPosixBracket = require('is-posix-bracket');
  
  isPosixBracket('[foo:]]');
  //=> false
  isPosixBracket('[xdigit:]]');
  //=> false
  isPosixBracket('[[:xdigit:]]');
  //=> true
  isPosixBracket('[[:xdigit:]]');
  //=> true
  isPosixBracket('[[:alpha:]123]');
  //=> true
  isPosixBracket('[[:alpha:]123]');
  //=> true
  isPosixBracket('[a-c[:digit:]x-z]');
  //=> true
  isPosixBracket('[:al:]');
  //=> true
  isPosixBracket('[abc[:punct:][0-9]');
  //=> true
  ```
  
  ## Related projects
  
  You might also be interested in these projects:
  
  * [braces](https://www.npmjs.com/package/braces): Fastest brace expansion for node.js, with the most complete support for the Bash 4.3 braces… [more](https://www.npmjs.com/package/braces) | [homepage](https://github.com/jonschlinkert/braces)
  * [expand-brackets](https://www.npmjs.com/package/expand-brackets): Expand POSIX bracket expressions (character classes) in glob patterns. | [homepage](https://github.com/jonschlinkert/expand-brackets)
  * [is-extglob](https://www.npmjs.com/package/is-extglob): Returns true if a string has an extglob. | [homepage](https://github.com/jonschlinkert/is-extglob)
  * [is-glob](https://www.npmjs.com/package/is-glob): Returns `true` if the given string looks like a glob pattern or an extglob pattern.… [more](https://www.npmjs.com/package/is-glob) | [homepage](https://github.com/jonschlinkert/is-glob)
  * [micromatch](https://www.npmjs.com/package/micromatch): Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. Just… [more](https://www.npmjs.com/package/micromatch) | [homepage](https://github.com/jonschlinkert/micromatch)
  
  ## Contributing
  
  Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/is-posix-bracket/issues/new).
  
  ## Building docs
  
  Generate readme and API documentation with [verb](https://github.com/verbose/verb):
  
  ```sh
  $ npm install verb && npm run docs
  ```
  
  Or, if [verb](https://github.com/verbose/verb) is installed globally:
  
  ```sh
  $ verb
  ```
  
  ## Running tests
  
  Install dev dependencies:
  
  ```sh
  $ npm install -d && npm test
  ```
  
  ## Author
  
  **Jon Schlinkert**
  
  * [github/jonschlinkert](https://github.com/jonschlinkert)
  * [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
  
  ## License
  
  Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
  Released under the [MIT license](https://github.com/jonschlinkert/is-posix-bracket/blob/master/LICENSE).
  
  ***
  
  _This file was generated by [verb](https://github.com/verbose/verb), v, on April 05, 2016._