Predefined Character Classes

Predefined Character Classes

The Pattern API contains a number of useful predefined character classes, which offer convenient shorthands for commonly used regular expressions:

Construct Description

.	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