正则表达式生成器不能保证值的唯一性。
The regular expression generator cannot guarantee unique values.
通过将基本模式更改为中级模式或更高模式，您可以使用表达式生成器为业务决策定义实际逻辑。
By changing from basic mode to intermediate mode or higher, you can use the expression builder to define the actual logic for the business decision.
如果选择实现通用表达式生成器类型，则必须将表达式生成器映射到关联的配置节名称。
If you choose to implement a common expression-builder type, you must map the expression builder to the associated section name in the configuration.
如图8所示，您也可以选择使用MessageBroker工具包中提供的XPath表达式生成器编写这些表达式。
As shown in Figure 8, you can optionally author these expressions using the XPath expression builder provided with the Message Broker toolkit.
它们是简单但功能强大的泛化正则表达式，比起传统的LALR或者LR-1语法的解析器生成器来说更易于使用。
They are a simple but powerful generalization of regular expressions that are easier to work with than the LALR or LR-1 grammars of traditional parser generators.
当谈到解析器生成器的时候，解析表达式语法（PEG）最近因为一篇BryanFord介绍的一种叫做“Packrat解析”优化的论文而变得很流行。
When it comes to parser generators, Parsing Expression Grammars (PEG) have become quite popular recently after a thesis by Bryan Ford introduced an optimization called "Packrat Parsing".
接下来的两行代码使用生成器表达式来处理文件对象ps .stdout，分析该文件并在其中搜索您正在查找的行。
The next two lines of code-use generator expressions to handle the file object ps.stdout and to parse it and search it for the lines you are looking for.
新特性包括：表达式闭包(expression closures)、生成器表达式(generator expressions)和本地的JSON编码及解码。
New feature include: expression closures, generator expressions, and native JSON encoding and decoding.
新特性包括：表达式闭包(expression closures)、生成器表达式(generator expressions)和本地的JSON编码及解码。
New feature include: expression closures, generator expressions, and native JSON encoding and decoding.
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