| Shortcut | Meaning | Language |
|---|---|---|
| \s | Whitespace characters (\t, \v, \r, \n, \f) | |
| \S | Non-whitespace characters | |
| \d | Any decimal digit (0-9) | |
| \D | Any character but a decimal digit | |
| \h | Any hexadecimal digit (0-9, A-F, a-f) | Ruby |
| \H | Any character but a hexadecimal digit | Ruby |
| \w | Word characters (A-Z, a-z, 0-9, _) | |
| \W | Non-word characters |