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downloads](https://img.shields.io/npm/dt/posix-character-classes.svg?style=flat)](https://npmjs.org/package/posix-character-classes) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/posix-character-classes.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/posix-character-classes)\n\n> POSIX character classes for creating regular expressions.\n\n## Install\n\nInstall with [npm](https://www.npmjs.com/):\n\n```sh\n$ npm install --save posix-character-classes\n```\n\nInstall with [yarn](https://yarnpkg.com):\n\n```sh\n$ yarn add posix-character-classes\n```\n\n## Usage\n\n```js\nvar posix = require('posix-character-classes');\nconsole.log(posix.alpha);\n//=> 'A-Za-z'\n```\n\n## POSIX Character classes\n\nThe POSIX standard supports the following classes or categories of charactersh (note that classes must be defined within brackets)[1]:\n\n| **POSIX class** | **Equivalent to** | **Matches** | \n| --- | --- | --- |\n| `[:alnum:]` | `[A-Za-z0-9]` | digits, uppercase and lowercase letters |\n| `[:alpha:]` | `[A-Za-z]` | upper- and lowercase letters |\n| `[:ascii:]` | `[\\x00-\\x7F]` | ASCII characters |\n| `[:blank:]` | `[ \\t]` | space and TAB characters only |\n| `[:cntrl:]` | `[\\x00-\\x1F\\x7F]` | Control characters |\n| `[:digit:]` | `[0-9]` | digits |\n| `[:graph:]` | `[^[:cntrl:]]` | graphic characters (all characters which have graphic representation) |\n| `[:lower:]` | `[a-z]` | lowercase letters |\n| `[:print:]` | `[[:graph] ]` | graphic characters and space |\n| `[:punct:]` | ``[-!\"#$%&'()*+,./:;<=>?@[]^_`{ | }~]`` | all punctuation characters (all graphic characters except letters and digits) |\n| `[:space:]` | `[ \\t\\n\\r\\f\\v]` | all blank (whitespace) characters, including spaces, tabs, new lines, carriage returns, form feeds, and vertical tabs |\n| `[:upper:]` | `[A-Z]` | uppercase letters |\n| `[:word:]` | `[A-Za-z0-9_]` | word characters |\n| `[:xdigit:]` | `[0-9A-Fa-f]` | hexadecimal digits |\n\n## Examples\n\n* `a[[:digit:]]b` matches `a0b`, `a1b`, ..., `a9b`.\n* `a[:digit:]b` is invalid, character classes must be enclosed in brackets\n* `[[:digit:]abc]` matches any digit, as well as `a`, `b`, and `c`.\n* `[abc[:digit:]]` is the same as the previous, matching any digit, as well as `a`, `b`, and `c`\n* `[^ABZ[:lower:]]` matches any character except lowercase letters, `A`, `B`, and `Z`.\n\n## About\n\n### Contributing\n\nPull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).\n\n### Building docs\n\n_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_\n\nTo generate the readme, run the following command:\n\n```sh\n$ npm install -g verbose/verb#dev verb-generate-readme && verb\n```\n\n### Running tests\n\nRunning and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:\n\n```sh\n$ npm install && npm test\n```\n\n### Author\n\n**Jon Schlinkert**\n\n* [github/jonschlinkert](https://github.com/jonschlinkert)\n* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)\n\n### License\n\nCopyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).\nReleased under the [MIT License](LICENSE).\n\n***\n\n_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 20, 2017._\n\n
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  1. table and examples are based on the WikiBooks page for [Regular Expressions/POSIX Basic Regular Expressions](https://en.wikibooks.org/wiki/Regular_Expressions/POSIX_Basic_Regular_Expressions), which is available under the [Creative Commons Attribution-ShareAlike License](https://creativecommons.org/licenses/by-sa/3.0/). ↩\n\n
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