Finally , the fourth parenthetical subexpression captures the path and or page information specified by the web address 最后,第四个括号子表达式捕获web地址指定的路径和/或页信息。
For local common subexpression optimization , the compiler examines short sections of code for common subexpressions 对于局部公共子表达式优化,编译器检查公共子表达式的一小部分代码。
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。
To avoid dealing with parentheses , w3eval determines which subexpression lies within the deepest nested pair of parentheses 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。
The expression can be any valid subexpression , but it is turned into a zero - width assertion , so this syntax is equivalent to 表达式可以是任何有效的子表达式,但它将变为零宽度断言,因此该语法等效于
A subexpression that performs a negative lookahead search , which matches the search string at any point where a string not matching 的字符串的起始点的搜索字符串。它是一个非捕获匹配,即不能捕获供以后使用的匹配。
To illustrate , these differences are possible within a single expression tree , not in cases where there is a user assignment involved after each subexpression 例如,在单个表达式树中可能会出现这些差异,而在每一子表达式后存在用户赋值的情况下则不会:
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。
Encloses the metacharacter to force the regular expression engine to remember a subexpression match which in this case will be any single character and save it under the name " char " 将元字符括在其中,以强制正则表达式引擎记住子表达式匹配(在此示例中将是任意单个字符) ,并以名称“ char ”保存它。
To find repeating whole words , you can modify the grouping subexpression to search for any group of characters preceded by a space instead of simply searching for any single character . you can substitute the subexpression 要找到重复的全字,您可以修改该分组子表达式,以搜索前面是空格的任何字符组,而不是只搜索任意单个字符。