[:graph:]代表printable and visible的字符,鸟哥书上说是除空格符(空格键与[TAB]键)之外的所有按键,那控制字符算不算[:graph:]呢?
http://www.regular-expressions.info/posixbrackets.html
不算。
| POSIX | Description | ASCII | Unicode | Shorthand | Java |
|---|---|---|---|---|---|
| [:alnum:] | Alphanumeric characters | [a-zA-Z0-9] | [\p{L&}\p{Nd}] | \p{Alnum} | |
| [:alpha:] | Alphabetic characters | [a-zA-Z] | \p{L&} | \p{Alpha} | |
| [:ascii:] | ASCII characters | [\x00-\x7F] | \p{InBasicLatin} | \p{ASCII} | |
| [:blank:] | Space and tab | [ \t] | [\p{Zs}\t] | \h | \p{Blank} |
| [:cntrl:] | Control characters | [\x00-\x1F\x7F] | \p{Cc} | \p{Cntrl} | |
| [:digit:] | Digits | [0-9] | \p{Nd} | \d | \p{Digit} |
| [:graph:] | Visible characters (i.e. anything except spaces, control characters, etc.) | [\x21-\x7E] | [^\p{Z}\p{C}] | \p{Graph} | |
| [:lower:] | Lowercase letters | [a-z] | \p{Ll} | \p{Lower} | |
| [:print:] | Visible characters and spaces (i.e. anything except control characters, etc.) | [\x20-\x7E] | \P{C} | \p{Print} | |
| [:punct:] | Punctuation and symbols. | [!"#$%&'()*+, \-./:;<=>?@ [\\\]^_`{|}~] | [\p{P}\p{S}] | \p{Punct} | |
| [:space:] | All whitespace characters, including line breaks | [ \t\r\n\v\f] | [\p{Z}\t\r\n\v\f] | \s | \p{Space} |
| [:upper:] | Uppercase letters | [A-Z] | \p{Lu} | \p{Upper} | |
| [:word:] | Word characters (letters, numbers and underscores) | [A-Za-z0-9_] | [\p{L}\p{N}\p{Pc}] | \w | |
| [:xdigit:] | Hexadecimal digits | [A-Fa-f0-9] | [A-Fa-f0-9] | \p{XDigit} |