posix-character-classes

posix-character-classes

POSIX character classes for creating regular expressions.

Install

Install with npm:

$ npm install --save posix-character-classes

Install with yarn:

$ yarn add posix-character-classes

Usage

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)^[1]:

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:]	``[-!"#$%&'()*+,./:;<=>?@[]^_`{	}~]``
[: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.

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ 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:

$ npm install && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.5.0, on April 20, 2017.

• 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/). ↩

Similar packages

Other packages similar to posix-character-classes

xregexp

XRegExp provides augmented (extended) regular expressions. It includes support for Unicode character classes, which can be used to achieve similar functionality to posix-character-classes. XRegExp is more feature-rich and supports additional regex enhancements.

regexgen

Regexgen generates regular expressions that match a set of strings. While it does not provide POSIX character classes, it can be used to create complex regular expressions programmatically, offering a different approach to regex construction.

re2

RE2 is a fast, safe, and thread-friendly alternative to backtracking regular expression engines like those used in JavaScript's native RegExp. It supports a subset of POSIX character classes and is designed for performance and safety.