POSIX character classes
Java already has support for POSIX character classes using the \p operator. RegExPlus adds support for them using the [:class:] POSIX bracket expressions.
\p{class}
Java already has support for POSIX character classes via the \p operator.
As an example, 0x\p{XDigit}++ will match a hex
number, for example, 0xFF.
Supported class names
\p{Lower}A lower-case alphabetic character:[a-z]\p{Upper}An upper-case alphabetic character:[A-Z]\p{ASCII}All ASCII:[\x00-\x7F]\p{Alpha}An alphabetic character:[\p{Lower}\p{Upper}]\p{Digit}A decimal digit:[0-9]\p{Alnum}An alphanumeric character:[\p{Alpha}\p{Digit}]\p{Punct}Punctuation: One of!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~\p{Graph}A visible character:[\p{Alnum}\p{Punct}]\p{Print}A printable character:[\p{Graph}\x20]\p{Blank}A space or a tab:[ \t]\p{Cntrl}A control character:[\x00-\x1F\x7F]\p{XDigit}A hexadecimal digit:[0-9a-fA-F]\p{Space}A whitespace character:[ \t\n\x0B\f\r]
[:class:]
RegExPlus adds support for POSIX classes in the form [:class:]. This is the same form supported by PCRE and Ruby.
As an example, 0x[[:xdigit:]]++ will match a hex
number, for example, 0xFF.
Supported class names
[:lower:]A lower-case alphabetic character:[a-z][:upper:]An upper-case alphabetic character:[A-Z][:ascii:]All ASCII:[\x00-\x7F][:alpha:]An alphabetic character:[[:lower:][:upper:]][:digit:]A decimal digit:[0-9][:alnum:]An alphanumeric character:[[:alpha:][:digit:]][:punct:]Punctuation: One of!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~[:graph:]A visible character:[[:alnum:][:punct:]][:print:]A printable character:[[:graph:]\x20][:blank:]A space or a tab:[ \t][:cntrl:]A control character:[\x00-\x1F\x7F][:xdigit:]A hexadecimal digit:[0-9a-fA-F][:space:]A whitespace character:[ \t\n\x0B\f\r][:word:]A word character:[\w]