当ast构建好，我们确定表达式在语法上是有效的，并且在提供了正确的上下文时将可以执行。
When the AST is ready, we are sure that the expression is syntactically valid and can be executed providing the right context.
利用土体与衬砌结构之间的连续性条件和衬砌结构内边界上的边界条件，确定表达式的未知系数。
By utilizing the inner boundary condition of the lining structure and the continuity conditions between the soil and the lining, the unknown coefficients in the expressions are determined.
解析器的主要工作之一就是确定您传递给它的任何表达式的有效性，并且让您知道。
One of the parser's main jobs is to determine the validity of any expression you pass it and to let you know.
存储策略筛选器用于检查候选存储区域的属性，确定哪些存储区域满足筛选器表达式。
Storage policy filters are used to examine the properties of candidate storage areas, and to determine which storage areas satisfy the filter expression.
仍然可以在表达式中使用该函数，确定在处理样式表元素的过程中处理程序是否支持某种内置的或扩展的函数。
You can still use this function in an expression to determine if a particular built-in or extension function is supported as the stylesheet element is being processed.
基于卡片的表单中的字段可以像表格中的单元格一样引用，可以包含数据，也可以包含能在运行时确定数据的表达式。
The fields in the card-based forms can be referenced like cells in a spreadsheet and can contain either data or an expression that determines the data at run-time.
该检索表达式在创建HTML组件时就已确定。
This search expression is determined when the HTML component is built.
此外，可以使用表达式根据流程变量动态确定某个具体用户。
Additionally an expression can be used to dynamically determine the specific user based on process variables.
要确定一列是否包含一个数字，可以使用一个正则表达式(第34行)。
To find out if a column contains a number, a regular expression can be used (line 34).
确定字符串是否与模式匹配是对正则表达式的最简单应用，如图1所示，而且易于操作。
Determining if a string matches a pattern is the simplest use of regular expressions and, as you see in Figure 1, it's, easy to do.
可以使用变量限制模式的参数化，就是说用规则之外的代码确定特定规则内的部分表达式。
You can use variables for limited parameterization of schemata, by which I mean allowing for parts of the expressions within certain rules to be specified using code outside the rule itself.
然后，它将遍历重写规则，每次遍历一个，对于每个规则，它将获取规则的LookFor属性，并使用正则表达式来确定是否在被请求的URL中找到了匹配的规则。
It then iterates through the rewrite rules one at a time, and for each rule, it grabs its LookFor property and USES a regular expression to determine if a match is found in the requested URL.
虽然从DB 2ContentManager提取的内容是动态生成的，但查询表达式是在开发人员创建Connect标签时确定的。
Although the content extracted from DB2 content Manager is dynamically generated, the query expression is determined when the developer creates the Connect tag.
跟踪程序模式配置项是一组正则表达式，它们指导WrappingJDBCDriver如何为目标数据库确定跟踪名称空间。
The tracer pattern configuration items are a set of regular expressions that instruct the WrappingJDBCDriver how to determine the tracing name space for this target database.
我还会使用Groovy的正则表达式(在感受Groovy中介绍)来确定传递给facade的消息。
I'll also be using Groovy's regular expressions (introduced in Feeling Groovy) to determine the messages passed to the facade.
例如，如果表达式不使用last函数，那么就不必执行先行处理来确定上下文列表中有多少元素。
For example, if the expression doesn't use the last function then it is not necessary to do look-ahead processing to determine how many elements there are in the context list.
详细的表达式检查能够确定错误确切的类型和位置。
A detailed expression check can determine the precise type and location of an error. There are seven categories of error checking
为了确定这些段落，将使用matches函数（XSLT 2.0中的新增内容），以确定某个字符串是否匹配正则表达式。
To determine this, they use the matches function (new in XSLT 2.0), which determines whether a string matches a regular expression.
includes属性的值是一个XPath表达式(可能从非常有限的xpath子集中选择)，它确定了将包含其文本的元素。
The value of the includes attribute is an XPath expression (possibly chosen from a very restricted subset of XPath) that identifies the element whose text is included.
Expect的扩展正则表达式功能非常强大，并且很容易通过代码确定格式。
Expect boasts extensive regular expression capabilities, and the formatting is easy to code.
通过执行成员赋值表达式 %htm:input.\input/reviewer% 来确定任务的所有者。
Execution of the staff assignment expression %htm:input.\input/reviewer%
本文不介绍用于动态选择Web服务的其他选项(例如确定最低执行成本或最佳质量的复杂表达式)。
Other options for dynamically selecting Web services (such as complex expressions that determine least execution cost or the best quality) are not covered here.
但是，实践证明对于很长的正则表达式这样太复杂了（很难确定group元素与正则表达式的关系）。
However, this proved too complex with long regexes (it was difficult to decide how the group elements related to the regex).
最简单的表达式之一仅确定一个变量(或者，如果该变量是一个业务对象，则是一个变量的字段，而不仅仅是一个简单类型)。
One of the simplest expressions identifies a variable only (or a field of a variable, if the variable is a business object, and not just a simple type).
和其名称一样，每个if -then规则包含一个Boolean表达式，用于确定是否执行在then子句中指定的一个或多个操作。
As the name implies, each if-then rule consists of a Boolean expression that determines whether to execute one or multiple actions specified in the then clauses.
步骤1：为避免括号的处理，W3Eval确定哪个子表达式处于嵌套最深的那对括号中。
Step 1: To avoid dealing with parentheses, W3Eval determines which subexpression lies within the deepest nested pair of parentheses.
您还可以使用XPath中的条件表达式来进一步精确定位特定节点的位置。
You can use conditional expressions in XPath to further pinpoint the location of specific nodes.
在计算XPath表达式时，条件的值将根据表达式的返回值确定，如表5所示。
When the XPath expression is evaluated, the value of the condition will be determined based on the return value of the expression as shown in Table 5.
计算XPath表达式时，条件的值将会基于表达式的返回值确定。
When the XPath expression is evaluated, the value of the condition will be determined based on the return value of the expression.
通过正则表达式来确定文本中的模式。
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