| Metacharacter | Alternative | Description |
|---|---|---|
\d |
[0-9] |
Match any digit character |
\D |
[^0-9] |
Match any non-digit character |
\w |
[a-zA-Z0-9_] |
Match any word character |
\W |
[^a-zA-Z0-9_] |
Match any non-word character |
\s |
Match any whitespace character (space, tab, newline) | |
\S |
Match any non-whitespace character | |
\0 |
Match null character | |
\t |
Match tab character | |
\n |
Match newline character | |
\r |
Match carriage return character | |
. |
Match any character except newline |
Sources: