java.util.regex - JRE Emulation | JRE Emulation


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.


MatchResult Holds the results of a successful match of a Pattern against a given string. 


Matcher The result of applying a Pattern to a given input. 
Pattern Patterns are compiled regular expressions. 


PatternSyntaxException Encapsulates a syntax error that occurred during the compilation of a Pattern