@Pointcut注解允许我们定义切入点表达式，而且必要时，还有被切入点绑定的参数的个数和类型。
The @Pointcut annotation allows us to define pointcut expressions and, where necessary, the number and type of arguments to be bound by the pointcut.
好，说完了这一点，我们就可以讲些复杂些的话题了，例如，假设我看到了这个表达式。
Right, having done that, we can certainly get to more complicated things, so for example, suppose I look at that expression.
实现这一点对于正则表达式而言并不是问题。
Allowing for this is not a problem with regular expressions.
还有个很有趣的现象要注意一下，就是我们可以用乘积法则,对向量表达式求导，无论是点乘或叉乘。
OK, now, so there's an interesting thing to note, which is that we can use the usual product rule for derivatives with vector expressions, with dot products or cross products.
即便有正则表达式的帮助，如何排除所访问节点最后一个标记中的值也需要动点脑筋。
Even with the help of regular expressions, you'd need to think a little about how to exclude the value from the last tag that's in the visits node.
要实现这一点，可以通过搜索XPath表达式 /output/Transfer/Amount，从而查找您想要的字段的标记。
To accomplish this, find the tag for the field that you want by searching for the XPath expression /output/Transfer/Amount.
LinQ还需要支持lambda表达式(闭包)，尽管这一点在前面的查询例子中体现得不是很明显。
LinQ also requires support for lambda expressions (closures), though this is not obvious from the previous query example.
最重要的一点是XPath表达式只能引用名称空间前缀限定的元素和属性名。
Foremost among them is that XPath expressions can only reference namespace-qualified element and attribute names by the use of namespace prefixes.
请注意，上面的正则表达式如何只捕获“connectionfrom”和一个非数字的字符串后面的数字和点。
Note how the regular expression above captures only digits and dots, after "connection from" and a string of non-digits.
一个JET中这样的例子是：通过扩展该扩展点，在XPath表达式中使用camelcase(参见jet源代码中的CamelCaseFunction)。
An example of this is in JET's ability to use camelcase in XPath expressions by extending this extension point (see the CamelCaseFunction in the JET source code).
在使用算术表达式时，还需要记住一点，在版本7.2之前，Vim只支持整数运算。
When using arithmetic expressions, it's also important to remember that, until version 7.2, Vim supported only integer arithmetic. A common mistake under earlier versions was writing something like.
它还可以采取动作；当解析器达到表达式中的那个条件点时，封装在中的代码块将会被执行。
It can also take actions; blocks of code enclosed in pairs will be executed when the parser reaches that point in an expression. For instance, one might write.
/ 来自于文件名的 /usr/home/builds/daily./ 部分（这个Perl表达式中的系列点，匹配诸如 .080908 之类的日期规约的七个特征）。
(The series of dots in this Perl expression matches the seven characters of date specifications such as .080908.)
该输入值可以是一个简单表达式，或者是由另一节点计算的一个值。
The input value can be a simple expression or be a value computed by another node.
您要注意的第一点是，这些正则表达式都在一行上。
The first thing you notice is that these regular expressions are all on one line.
由于在变量名后面没有任何步骤，因此该查询表达式将产生一个单一节点，即正好是当前的节点。
Since there are no steps following the variable name, this query expression results in a single node which happens to be the current node.
函数编程是一种编程风格，它将关注点从执行命令转移到表达式计算。
Functional programming is a style of programming that moves the focus from executing commands to the evaluation of expressions.
正则表达式匹配最常见的场景是从字符序列的某个点上开始，向前移动，直到找到所有匹配，并到达序列末尾为止。
The most common scenario for matching regular expressions is to start at some point in a character sequence and move forward until all matches have been found and the end of the sequence is reached.
但您并不知道表达式实际上有一点差别。
But you didn't know that the expression was actually a little off.
错误消息中显示的原因码 “XUTY0008” 表示 “替换表达式的目标节点不是单一节点”。
The reason code "XUTY0008" shown in the error message quickly points you to the fact that "the target node of a replace expression is not a single node".
通过为每个特性编写XPath表达式可以做到这一点。
This is done by writing an XPath expression for each feature.
XPath表达式中的二进制逻辑比简单的true和false要稍微复杂一点。
Binary logic in XPath expressions is a bit more complex than simply true and false.
尽管向XPath表达式添加名称空间前缀需要进行一点额外的录入，但是该解决方案可行，且不增加额外的处理。
Although a little extra typing is required to add the namespace prefixes to the XPath expressions, this solution works and doesn't add extra processing.
这主要是由于前面两点造成的，但几乎在使用键替代 Xpath表达式的每一种情况下，XSL转换都更为简单，时间也更短。
This is largely a result of the previous two items, but in almost every case using keys instead of XPath expressions results in simpler and shorter XSL transforms.
用双代数形式表示的不变量具有简洁、具体的表达式，可以由图像点坐标和基础矩阵直接求出。
The invariants of double algebra's form has simple and explicit expression which can be computed directly by coordinates of image points and fundamental matrix.
但是如果所选择的方案未能发现相应匹配，或者后来的匹配也失败了，正则表达式将回溯到最后一个决策点，然后在剩余的选项中选择一个。
But if the chosen option can't find a match or anything later in the regex fails, the regex backtracks to the last decision point where untried options remain and chooses one.
现在，对模板表达式和语句有了一点感觉了吧。除插值表达式外，还有各种各样的数据绑定语法，是学习它们是时候了。
Now that we have a feel for template expressions and statements, we're ready to learn about the varieties of data binding syntax beyond interpolation.
我取出了我在第一次谈论这个主题时写作例子的表达式计算器，之后修改了一点代码，增加实时性，如字节码编译。
I took the ExpressionEvaluator I wrote as example for the first post about this topic, and then I edited a bit the code adding just in time AS Bytecode compilation .
我取出了我在第一次谈论这个主题时写作例子的表达式计算器，之后修改了一点代码，增加实时性，如字节码编译。
I took the ExpressionEvaluator I wrote as example for the first post about this topic, and then I edited a bit the code adding just in time AS Bytecode compilation .
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