Usage

var posix = require('{%= name %}');
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

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.

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. ↩