Matching Predefined Character Classes

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Following are various examples of matching predefined character classes using regular expression in java.

Sr.No	Construct & Matches
1	. Any character (may or may not match line terminators).
2	\d A digit: [0-9].
3	\D A non-digit: [^0-9].
4	\s A whitespace character: [ \t\n\x0B\f\r]
5	\S A non-whitespace character: [^\s].
6	\w A word character: [a-zA-Z_0-9].
7	\W A non-word character: [^\w]