See: Description
| Interface | Description | 
|---|---|
| MatchResult | The result of a match operation. | 
| Class | Description | 
|---|---|
| Matcher | An engine that performs match operations on a character sequence by interpreting a  Pattern. | 
| Pattern | A compiled representation of a regular expression. | 
| Exception | Description | 
|---|---|
| PatternSyntaxException | Unchecked exception thrown to indicate a syntax error in a
 regular-expression pattern. | 
 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.
An excellent tutorial and overview of regular expressions is Mastering Regular Expressions, Jeffrey E. F. Friedl, O'Reilly and Associates, 1997.
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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