sfcode
An Online Competing and Development Environment
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POSIX character classes for creating regular expressions.
Install with npm:
Install with yarn:
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:]
| [-!"#$%&'()*+,./:;<=>?@[]^_`{ | }~]
| 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 |
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:
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:
Jon Schlinkert
Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).
This file was generated by verb-generate-readme, v0.5.0, on April 20, 2017.
<section class="footnotes">
table and examples are based on the WikiBooks page for Regular Expressions/POSIX Basic Regular Expressions, which is available under the Creative Commons Attribution-ShareAlike License. ↩
</section>