The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
Now that you've completed this lesson on regular expressions, you'll probably find that your main references will be the API documentation for the following classes: 现在您已经完成了关于正则表达式的这一课，您可能会发现您的主要参考将是以下类的API文档：Pattern, Matcher, and PatternSyntaxException.Pattern、Matcher和PatternSyntaxException。
For a more precise description of the behavior of regular expression constructs, we recommend reading the book Mastering Regular Expressions by Jeffrey E. F. Friedl.为了更精确地描述正则表达式构造的行为，我们建议阅读Jeffrey E.F.Friedl的《掌握正则表达式》一书。