Predefined Character Classes
The Pattern API contains a number of useful predefined character classes, which offer convenient shorthands for commonly used regular expressions:
. |
Any character (may or may not match line terminators) |
\d |
A digit: [0-9]
|
\D |
A non-digit: [^0-9]
|
\s |
A whitespace character: [ \t\n\x0B\f\r]
|
\S |
A non-whitespace character: [^\s]
|
\w |
A word character: [a-zA-Z_0-9]
|
\W |
A non-word character: [^\w]
|
https://docs.oracle.com/javase/tutorial/essential/regex/pre_char_classes.html
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