默认指定的子句可以为一个常量、一个特殊的寄存器、另一个全局变量、一个表达式或关键字NULL。
The default clause specified can be either a constant, a special register, another global variable, an expression or the keyword NULL.
第一个参数是一个正则表达式，它代表触发客户机从数据库获取XML文档的关键字。
The first parameter is described using a regular expression and represents the keyword triggering the client to retrieve XML documents from the database.
RDL语言尽管很简洁，却使你能够表达很多模型转换中使用的关键概念(比如，通讯，表达式，以及条件)。
Although it is concise, the RDL language allows you to express a number of essential concepts used in model transformation (for example, correspondences, expressions, and conditions).
转换表达式的开头是可选的“transform”关键字，然后是COPY、MODIFY和return子句。
A transform expression starts with the optional "transform" keyword followed by a COPY, MODIFY, and a RETURN clause.
它包括关键字attribute、所需的属性名和属性值的表达式，见更新15。
It consists of the keyword attribute followed by the desired attribute name, plus an expression for the attribute value. You see this in Update 15.
正如前面提到的，插件扩展了即时消息传递客户机，它会根据初始化文件中的正则表达式，分析消息并寻找特定的关键词。
Remember that the instant messaging client was extended to analyze and scan the messages for particular key phrases, as specified through a regular expression in the initialization file.
规则表达式可以采用各种格式，一项关键的设计决策就是决定哪些规则最适合用哪种形式表达。
As discussed, rule expressions may take on a wide range of forms, and a key design decision is the identification of which rules are best expressed in which form.
区分贪婪模式与懒人模式是完全理解高级正则表达式的关键。
Alternatively, the ‘U’ modifier may be used to make all repetiton operators lazy. Differentiating between greediness and laziness is key to fully understanding advanced regular expressions.
返回的结果本身没有多少用处，但关键是可以使用DOM对XPath表达式求值返回的Node进行操作。
In itself, this isn't very useful, but what's important is that you can use DOM manipulation code on the Node returned from the XPath expression evaluation.
在本例中，您使用了更为强大的方式：PHP的preg_replace，它接受正则表达式作为其搜索关键词。
In this case, you use something a bit more powerful: PHP's preg_replace, which takes a regular expression as its search term.
默认指定的子句可以为一个常量、一个特殊的寄存器、另一个全局变量、一个表达式或关键字NULL。
The default clause specified can be either a constant, a special register, another global variable, an expression or the keyword NULL.
我将介绍基本关键帧的动画，并教你一些简单的表达式，您可以使用它来实现复杂的动画，而不实际设置任何关键帧！
I'll cover animating with basic keyframes and teach you some simple expressions you can use to achieve complex animations without actually setting any keyframes!
现在想想一下，当你尝试理解他人写的正则表达式，该表达式在一个大程序关键函数的中间。
Now imagine trying to understand someone else's regular expressions, in the middle of a critical function of a large program.
预防此类问题的关键是确保正则表达式的两个部分不能对字符串的同一部分进行匹配。
The key to preventing this kind of problem is to make sure that two parts of a regex cannot match the same part of a string.
使用目前常用的算符优先法，对通用表达式计算过程进行了介绍，并对其中的关键问题——运算符优先矩阵的设计和实现进行了研究。
Using the current commonly used operator priority method, introduces a common expression of the calculation process, and one of the key issues, operator precedence matrix design and implementation.
第二章首先介绍了平行多辊矫直机的工作原理，并推导了影响矫直效果的关键参数的数学表达式，并根据工程应用进行简化。
The work theory of parallel multi-roll straightener is first introduced in chapter two, and the key parameter's mathematical expression is acquired and simplified according to engineering application.
本文旨在探讨一种多个关键字表达式的权限设置及组合方式，以实现灵活多样的数据库排序效果。
The intention of this paper is to discuss a priority assignation and combination method of many keyword expressions, in order to implement flexible and multiple database sorting.
小外径的电涡流传感器薄线圈的参数优化设计的关键是寻求合理的目标函数的表达式。
The key of the optimization design of a small eddy current sensor coil is to find out the reasonable expression of the optimization destination function.
小外径的电涡流传感器薄线圈的参数优化设计的关键是寻求合理的目标函数的表达式。
The key of the optimization design of a small eddy current sensor coil is to find out the reasonable expression of the optimization destination function.
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