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POSIX character classes for creating regular expressions.
Install with :
Install with :
The POSIX standard supports the following classes or categories of charactersh (note that classes must be defined within brackets):
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.
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
Pull requests and stars are always welcome. For bugs and feature requests, .
(This project's readme.md is generated by , please don't edit the readme directly. Any changes to the readme must be made in the readme template.)
Copyright © 2017, . Released under the .
This file was generated by , 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/).
