So let's look at the first subexpression.
因此，让我们研究一下第一个子表达式。
NOT - Matches documents where the first subexpression.
NOT—匹配那些第一个子表达式匹配的文档。
One such trick is the? : operator at the beginning of a subexpression.
其中一个技巧是子表达式开始处的？：运算符。
The subexpression in this case is everything enclosed in parentheses.
在此情况下，子表达式是括在括号中的所有内容。
You can also refer to a subexpression from within a replacement string.
还可以从替换字符串中引用子表达式。
Parentheses in a regular expression are used to create a subexpression.
正则表达式中的括号用于创建子表达式。
In this optimization, the value of a common subexpression is calculated once.
在此优化中，计算一次公共子表达式的值。
The second parenthetical subexpression saves the domain address part of the address.
第二个括号子表达式保存地址的域地址部分。
The third parenthetical subexpression saves a Web site port number, if one is specified.
第三个括号子表达式保存网站端口号（如果指定了的话）。
1 (or \ \ 2) means the pattern matched by the first (or second) subexpression of the match expression.
1(或\ \2)表示模式与匹配表达式的第一个(或第二个)子表达式相匹配。
Subexpression operators. Used in conjunction with boolean operators to create more complex expressions.
子表达式运营商。在与布尔运算符用于创建更复杂的表达式。
You can refer to a subexpression from within a regular expression, and from within a replacement string.
可以从正则表达式和替换字符串中引用子表达式。
A collection of ranges is returned, one for each matched subexpression, and their properties are read-only.
传回范围的集合(一个集合对一个符合的子运算式)，而且它们的属性都是唯读的。
The input and output of every query or subexpression within a query each form an instance of the query data model.
查询中的每个查询或子表达式的输入和输出都将形成Query数据模型的实例。
For global common subexpression optimization, the compiler searches entire functions for common subexpressions.
对于全域通用子运算式最佳化，编译器会搜寻整个函式中有没有通用子运算式。
The second subexpression, (\s), just means "match any whitespace character and let us refer back to what was matched.
第二个子表达式 (\s)只表示“查找与任何空格字符匹配的字符串，让我们回过来看什么与之匹配”。
For local common subexpression optimization, the compiler examines short sections of code for common subexpressions.
对于区域通用子运算式最佳化，编译器会检查程序码的短区段中有没有通用子运算式。
This means "match a subpattern, but don't include the match in the back-references." So let's examine the subexpression
这表示“查找子模式的匹配字符串，但不包括反向引用中的匹配结果”。
When we embed a conditional expression in a larger expression, we usually must parenthesize the conditional subexpression.
当我们要在一个更大的表达式中嵌入条件表达式时，通常必须用圆括号把条件表达式括起来。
Step 1: To avoid dealing with parentheses, W3Eval determines which subexpression lies within the deepest nested pair of parentheses.
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。
This is placed immediately in front of the feature, operator, or subexpression to reverse the Boolean meaning of the expression.
这是摆立即在前面的功能，操作员，或子表达式扭转布尔表达式的意义。
Use (and) parentheses (just as you do in mathematics) to apply a modifier to a subexpression. Here's an example: Given text file test.txt.
使用(和)圆括号(就像数学中的用法)将修饰符应用到子表达式。
The NOT operator. This is placed immediately in front of the feature, operator, or subexpression to reverse the Boolean meaning of the expression.
NOT运算符。这是摆立即在前面的功能，操作员，或子表达式扭转布尔表达式的意义。
Finally, we get the second child subexpression, which other than the "don't refer" operator consists of some stuff in square brackets, and a plus sign.
最后，我们看到第二个子表达式，它除了有由方括号组成的“不引用”运算符外，还有一个加号。
First notice that this subexpression is itself composed of two child subexpressions, with some stuff in the middle that is not part of any child subexpression.
首先，请注意这个子表达式本身由两个子表达式组成，两者之间的字符并不属于任何一方。
The process of evaluation is similar to calculating by hand: while the expression contains parentheses, the subexpression inside the deepest nested pair of parentheses is evaluated.
求值过程类似于手工计算：如果表达式中包含括号，先求嵌套最深的括号对中的子表达式的值。
The process of evaluation is similar to calculating by hand: while the expression contains parentheses, the subexpression inside the deepest nested pair of parentheses is evaluated.
求值过程类似于手工计算：如果表达式中包含括号，先求嵌套最深的括号对中的子表达式的值。
应用推荐