比较表达式中的不同数据类型。
如果会绕过索引，应该对比较表达式的RHS执行类型转换。
If the index is being bypassed, then the RHS of the comparison should be type-cast.
一个蒙版就是个正则表达式，它代表了一次比较期间应该被忽略的文本。
A mask is a regular expression that represents text that should be ignored during a comparison.
您可以将数据与正则表达式进行比较，如果它们匹配，则知道数据是有效的。
You can compare data to a regular expression; if they match, you know your data is valid.
当然，正则表达式被限定为严格的字符串比较。
Of course, regular expressions are limited to strict string comparisons.
当需要为不同类型的文档使用不同的存储区域时，根据最大大小选择存储区域的筛选器表达式比较有用。
A filter expression to select storage areas based on their maximum size can be useful when you want to utilize different storage for different classes of documents.
表达式的下一个部分比较有趣。
当添加额外存储区域到已有策略时，根据存储区域名称选择存储区域的筛选器表达式会比较有用。
A filter expression to select storage areas based on their name can be useful when adding additional storage areas to an existing policy.
在XPath表达式中，比较字符串和Boolean函数会得到非预期的结果。
In an XPath expression, comparing a string and a Boolean function can yield unexpected results.
很多程序利用布尔表达式，Python提供一整套布尔比较和逻辑运算，详细信息请分别参见表1 和表2。
Many programs utilize Boolean expressions, and Python provides the full range of Boolean comparison and logical operations, as detailed in tables 1 and 2, respectively.
这说明，该函数必须在一个涉及比较操作并且引用了索引扩展hash _ index的搜索方法“equals”的表达式中使用。
It says that the function must be used in an expression involving the comparison operation and that the search method "equals" of the index extension hash_index is referred to.
XPath 2.0的量化表达式可以明确说明如何执行这样的比较。
The quantified expressions of XPath 2.0 let you explicitly state how you prefer to perform such comparisons.
使用基于olap或dmr的包时，如果报告包含比较不同数据类型的值的表达式，那么以dynamicQueryMode执行报告将生成以下错误消息。
When using OLAP or DMR-based packages, reports with expressions that compare values with different data types will produce the following error in Dynamic Query mode.
这些结果非常单调，与图1比较时更是如此，图1是来自一个教程的屏幕截图，该教程使用计算XPath的工具对这个表达式进行图形化计算。
These results look pretty bland, especially if you compare them to Figure 1, a screen capture from the tutorial where this same expression was evaluated graphically using a tool for evaluating XPaths.
例如，下列的代码声明了一个Comparator，该表达式对字符串的长度进行比较，并使用一个lambda表达式来定义Comparator：。
For example, the following code declares a Comparator that compares strings by length and USES a lambda expression to define the Comparator:.
regmatch(re,text)函数将比较正则表达式和文本，如果没有匹配的话就生成Null 值，否则生成一个由成对整数组成的数组（双元素数组）。
The regmatch(re, text) function compares the regular expression to the text, yielding either Null for no matches or an array of pairs of integers (a two-element array).
如下是一些可能比较有趣的表达式树的用法。
Here are some USES of expression trees that may be interesting.
表达式应该首先选择全部CD，然后把这些CD的style属性和“folk”进行比较。
You'd use an expression to first select all the CDs, and then compare the style attributes of those CDs to the value "folk."
这个应用程序比较简单(尽管其中使用了复杂的XPath表达式)，但是显然还有许多改进的可能性。
This particular application is comparatively simple (for all the fairly convoluted XPath expressions), but obviously has a lot of ramifications.
如果已经将存储设备挂载在特定目录路径下，那么根据根目录路径选择文件存储区域的筛选器表达式比较有用。
A filter expression to select file storage areas based on its root directory path can be useful if you have organized your storage devices to be mounted under specific directory paths.
与把值分配给不同变量而将表达式分成多行相比较，将一个表达式放在一行上看着更整齐时。
When an expression looks cleaner on one line, rather than split into multiple lines by assigning values to different variables.
这个表达式可以使用逻辑比较操作。
比较复杂的表达式是Atom表达式。
要在SquirrelShell中使用正则表达式，需要先定义正则表达式，对其进行编译，进行比较，然后再迭代结果(如果有的话)。
To use a regular expression in Squirrel Shell, you define the regular expression, compile it, make a comparison, then iterate over the results, if any.
综合比较梁、柱的塑性铰公式，建立简化塑性铰长度表达式；
The simplified expression of plastic hinge is presented on the basis of existing equations.
将隔震结构的周期与临界周期和最大隔震周期比较，就可以得到相应高宽比限值的表达式。
By comparing the isolation period with the critical and maximum periods, the limit ratio can be obtained by using the corresponding formulas.
具有不同语法结构的属性表达式也可以比较，以发现不同授权规则间可能存在的关系。
Comparison between attribute expressions without identical syntax structures is permitted to gain an insight into the relationships of all kinds of authorization rules.
并与传统的功率理论表达式相比较，具有一定的一致性和物理意义。
Compared with the traditional power theory expression, this algorithm has certain uniformity and its physics significance.
并与传统的功率理论表达式相比较，具有一定的一致性和物理意义。
Compared with the traditional power theory expression, this algorithm has certain uniformity and its physics significance.
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