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posix-character-classes
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Readme
POSIX character classes for creating regular expressions.
Install with npm:
$ npm install --save posix-character-classes
Install with yarn:
$ yarn add posix-character-classes
var posix = require('posix-character-classes');
console.log(posix.alpha);
//=> 'A-Za-z'
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 |
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
.Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
(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 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
Jon Schlinkert
Copyright © 2017, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.5.0, on April 20, 2017.
FAQs
POSIX character classes for creating regular expressions.
The npm package posix-character-classes receives a total of 11,402,589 weekly downloads. As such, posix-character-classes popularity was classified as popular.
We found that posix-character-classes demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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