Package java.util.regex

Classes for matching character sequences against patterns specified by regular expressions.

An instance of the Pattern class represents a regular expression that is specified in string form in a syntax similar to that used by Perl.

Instances of the Matcher class are used to match character sequences against a given pattern. Input is provided to matchers via the CharSequence interface in order to support matching against characters from a wide variety of input sources.

Unless otherwise noted, passing a null argument to a method in any class or interface in this package will cause a NullPointerException to be thrown.

Related Documentation

An excellent tutorial and overview of regular expressions is Mastering Regular Expressions, Jeffrey E. F. Friedl, O'Reilly and Associates, 1997.

Interface Summary
Interface Description

The result of a match operation.

Class Summary
Class Description

An engine that performs match operations on a character sequence by interpreting a Pattern.


A compiled representation of a regular expression.

Exception Summary
Exception Description

Unchecked exception thrown to indicate a syntax error in a regular-expression pattern.