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# posix-character-classes [](https://www.npmjs.com/package/posix-character-classes) [](https://npmjs.org/package/posix-character-classes) [](https://npmjs.org/package/posix-character-classes) [](https://travis-ci.org/jonschlinkert/posix-character-classes)
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> POSIX character classes for creating regular expressions.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save posix-character-classes
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```
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Install with [yarn](https://yarnpkg.com):
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```sh
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$ yarn add posix-character-classes
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```
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## Usage
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```js
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var posix = require('posix-character-classes');
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console.log(posix.alpha);
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//=> 'A-Za-z'
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```
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## POSIX Character classes
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The POSIX standard supports the following classes or categories of charactersh (note that classes must be defined within brackets)<sup class="footnote-ref"><a href="#fn1" id="fnref1">[1]</a></sup>:
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| **POSIX class** | **Equivalent to** | **Matches** |
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| --- | --- | --- |
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| `[:alnum:]` | `[A-Za-z0-9]` | digits, uppercase and lowercase letters |
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| `[:alpha:]` | `[A-Za-z]` | upper- and lowercase letters |
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| `[:ascii:]` | `[\x00-\x7F]` | ASCII characters |
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| `[:blank:]` | `[ \t]` | space and TAB characters only |
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| `[:cntrl:]` | `[\x00-\x1F\x7F]` | Control characters |
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| `[:digit:]` | `[0-9]` | digits |
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| `[:graph:]` | `[^[:cntrl:]]` | graphic characters (all characters which have graphic representation) |
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| `[:lower:]` | `[a-z]` | lowercase letters |
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| `[:print:]` | `[[:graph] ]` | graphic characters and space |
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| `[:punct:]` | ``[-!"#$%&'()*+,./:;<=>?@[]^_`{ | }~]`` | all punctuation characters (all graphic characters except letters and digits) |
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| `[:space:]` | `[ \t\n\r\f\v]` | all blank (whitespace) characters, including spaces, tabs, new lines, carriage returns, form feeds, and vertical tabs |
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| `[:upper:]` | `[A-Z]` | uppercase letters |
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| `[:word:]` | `[A-Za-z0-9_]` | word characters |
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| `[:xdigit:]` | `[0-9A-Fa-f]` | hexadecimal digits |
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## Examples
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* `a[[:digit:]]b` matches `a0b`, `a1b`, ..., `a9b`.
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* `a[:digit:]b` is invalid, character classes must be enclosed in brackets
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* `[[:digit:]abc]` matches any digit, as well as `a`, `b`, and `c`.
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* `[abc[:digit:]]` is the same as the previous, matching any digit, as well as `a`, `b`, and `c`
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* `[^ABZ[:lower:]]` matches any character except lowercase letters, `A`, `B`, and `Z`.
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## About
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Building docs
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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Running 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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 20, 2017._
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<hr class="footnotes-sep">
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<section class="footnotes">
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<ol class="footnotes-list">
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<li id="fn1" class="footnote-item">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/). <a href="#fnref1" class="footnote-backref">↩</a>
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</li>
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</ol>
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</section>
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