Regular Expression : Predefined character classes

The Pattern API contains a number of useful predefined character classes.

Character class	Description
.	Matches any character
\d	Matches a digit: [0-9]
\D	Matches a non-digit: [^0-9]
\h	Matches a horizontal whitespace character: [ \t\xA0\u1680\u180e\u2000-\u200a\u202f\u205f\u3000]
\H	Matches a non-horizontal whitespace character: [^\h]
\s	Matches a whitespace character: [ \t\n\x0B\f\r]
\S	Matches a non-whitespace character: [^\s]
\v	Matches a vertical whitespace character: [\n\x0B\f\r\x85\u2028\u2029]
\V	Matches a non-vertical whitespace character: [^\v]
\w	Matches a word character: [a-zA-Z_0-9]
\W	Matches a non-word character: [^\w]

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