Package: java.util.regex
Overview
Classes for matching character sequences against patterns specified by regular
expressions.
An instance of the java.util.regex.Pattern class represents a regular expression that is specified in string form in a syntax similiar to that used by Perl.
Instances of the java.util.regex.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.
Related Documentation
An excellent tutorial and overview of regular expressions is Mastering Regular Expressions, Jeffrey E. F. Friedl, O'Reilly and Associates, 1997.