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Classes de caractères
| POSIX | Description | ASCII | ||
|---|---|---|---|---|
| [:alnum:] | Alphanumeric characters | [a-zA-Z0-9] | ||
| [:alpha:] | Alphabetic characters | [a-zA-Z] | ||
| [:ascii:] | ASCII characters | [\x00-\x7F] | ||
| [:blank:] | Space and tab | [ \t] | ||
| [:cntrl:] | Control characters | [\x00-\x1F\x7F] | ||
| [:digit:] | Digits | [0-9] | ||
| [:graph:] | Visible characters (anything except spaces and control characters) | |||
| [:lower:] | Lowercase letters | |||
| [:print:] | Visible characters and spaces (anything except control characters) | |||
| [:punct:] | Punctuation (and symbols). | |||
| [:space:] | All whitespace characters, including line breaks | |||
| [:upper:] | Uppercase letters | |||
| [:word:] | Word characters (letters, numbers and underscores) | |||
| [:xdigit:] | Hexadecimal digits | [A-Fa-f0-9][A-Fa-f0-9] | ||