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