Useful Tables - The Java Programming Language - page 1119

P REDEFINED CHARACTER CLASSES

non-whitespace character; [^\s] \S

word character; [a-zA-Z_0-9]

\w

non-word character; [^\w]

\W

J AVA CHARACTER CLASSES

as defined by Character.isLowerCase

\p{javaLowerCase}

as defined by Character.isUpperCase

\p{javaUpperCase}

as defined by Character.isWhitespace

\p{javaWhitespace}

as defined by Character.isMirrored

\p{javaMirrored}

POSIX CHARACTER CLASSES ( US - ASCII ONLY)

lowercase alphabetic character; [a-z]

\p{Lower}