Regular Expressions - Java Tutorial 5.0 英文版

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Lesson: Regular Expressions

by Scott A. Hommel

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Note: This lesson covers an API introduced in the latest release of the Java^TM 2 Platform Standard Edition, version 1.4. Visit the J2SE 1.4 download page.

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This lesson explains how to use the java.util.regex API for pattern matching with regular expressions. This lesson does not assume the that you have any previous experience with regular expressions. Although the syntax of regular expressions that this package accepts is similar to Perl, knowledge of the Perl programming language is not a prerequisite. This lesson starts with the basics, and gradually builds to cover more advanced techniques.

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Note: We recommend that you open java.util.regex API specification in a separate browser window. You may want to consult it throughout this lesson.

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Introduction

Gives a general overview of regular expressions. It also introduces the core classes that comprise the regex API.

Test Harness

Defines reusable code for testing and explores pattern matching with regular expressions.

String Literals

Introduces basic pattern matching, metacharacters, and quoting.

Character Classes

Describes simple character classes, negation, ranges, unions, intersections, and subtraction.

Predefined Character Classes

Describes the basic predefined character classes for whitespace, word, and digit characters.

Quantifiers

Explains greedy, reluctant, and possessive quantifiers for matching a specified expression x number of times.

Capturing Groups

Explains how to create groups so that you can treat multiple characters as a single unit.

Boundary Matchers

Describes line, word, and input boundaries.

Methods of the Pattern Class

Examines other useful methods of the Pattern class, and explores advanced features such as compiling with flags and using embedded flag expressions.

Methods of the Matcher Class

Describes the commonly-used methods of the Matcher class.

Methods of the PatternSyntaxException Class

Describes how to examine a PatternSyntaxException.

Additional Resources

To read more about regular expressions, consult this section for additional resources.

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