Regular Expression Package for Java

It supports:

char

Match any character literally that doesn't have special significance. Below are characters with special significance. You can backslash special characters to have them treated as literals.

.

Match any character.

[...]

Match any in a class of characters, e.g., [a-z] matches all the characters between 'a' and 'z' (inclusive).

[^...]

Match any NOT in a class of characters, e.g., [^a-z] matches all characters NOT between 'a' and 'z' (inclusive).

\s

Matches a white space character (Space, Linefeed, Return, Tab).

\S

Matches a non-white space character.

\w

Matches word characters, e.g., same as [a-zA-Z0-9_]

\W

Matches non-word characters (opposite of \w)

\d

Matches digits 0-9.

\D

Matches everything except 0-9.

\n, \r, \f, \t

Matches NL, CR, FF, TAB respectively.

$

Matches at the end of a line.

^

Matches at the beginning of a line.

\b

Matches if at a word boundery (consumes no characters).

\B

Matches if NOT at a word boundery.

(

Marks beginning of a group of matched characters.

)

Marks ending of a group of matched characters.

|

NEW!
Separates two alternative matches, e.g., abc|def matches abc or def. Parentheses are used to specify precedence, and "|" is by default the lowest precedence.

\0, ..., \9

Matches a previous (parenthisized) group of matched characters.

+

Match one or more occurrences of previous RE

*

Match zero or more occurrences of previous RE

?

Match zero or one occurrences of previous RE