1  'use strict';
 2  
 3  /**
 4   * POSIX character classes
 5   */
 6  
 7  module.exports = {
 8    alnum: 'a-zA-Z0-9',
 9    alpha: 'a-zA-Z',
10    ascii: '\\x00-\\x7F',
11    blank: ' \\t',
12    cntrl: '\\x00-\\x1F\\x7F',
13    digit: '0-9',
14    graph: '\\x21-\\x7E',
15    lower: 'a-z',
16    print: '\\x20-\\x7E ',
17    punct: '\\-!"#$%&\'()\\*+,./:;<=>?@[\\]^_`{|}~',
18    space: ' \\t\\r\\n\\v\\f',
19    upper: 'A-Z',
20    word: 'A-Za-z0-9_',
21    xdigit: 'A-Fa-f0-9'
22  };