Matching POSIX Character Classes

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

Sr.No Construct & Matches
1 \p{Lower}

A lower-case alphabetic character: [a-z].
2 \p{Upper}

An upper-case alphabetic character:[A-Z].
3 \p{ASCII}

All ASCII:[\x00-\x7F].
4 \p{Alpha}

An alphabetic character:[\p{Lower}\p{Upper}].
5 \p{Digit}

A decimal digit: [0-9].
6 \p{Alnum}

An alphanumeric character:[\p{Alpha}\p{Digit}].
7 \p{Punct}

Punctuation: One of !"#$%&'()*+,-./:;<=>?@[\]^_>{|}<.>
8 \p{Graph}

A visible character: [\p{Alnum}\p{Punct}].
9 \p{Print}

A printable character: [\p{Graph}\x20].
10 \p{Blank}

A space or a tab: [ \t].
11 \p{XDigit}

A hexadecimal digit: [0-9a-fA-F].
12 \p{Space}

A whitespace character: [ \t\n\x0B\f\r].
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