metacharacters

metacharacters

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• 网络元字符；元字符集；正则表达式元字符集

例句

A number of metacharacters require special treatment when trying to match them.

许多元字符要求在试图匹配它们时特别对待。

The metacharacters described in the following table do not cause the engine to advance through the string or consume characters.

下表中描述的元字符不会使引擎在字符串中前进或使用字符。

The word boundary metacharacters ensure that only whole words are detected.

字边界元字符确保只检测整个单词。

A few characters are used in patterns as metacharacters to indicate repetition, grouping, or positioning.

几个字符模式中使用的元字符显示重复，分组，或定位。

Here's a complete list of the metacharacters; their meanings will be discussed in the rest of this HOWTO.

这里有一个元字符的完整列表；其含义会在本指南余下部分进行讨论。

Explains the concept of escaping characters and how to create a regular expression that matches metacharacters.

说明转义符的概念以及如何创建与元字符匹配的正则表达式。

The set of metacharacters gives regular expressions their processing power.

元字符使正则表达式具有处理能力。

Explains the characters that comprise a regular expression, the characters that comprise metacharacters, and the behavior of metacharacters.

说明构成正则表达式的字符、构成元字符的字符以及元字符的行为。

Ordinary characters consist of all printable and non-printable characters that are not explicitly designated as metacharacters.

普通字符包括没有显式指定为元字符的所有可打印和不可打印字符。

Regular expressions are built from characters and operators, augmented by metacharacters.

正则表达式通过元字符加强的字符和操作符构建。

Small expressions are combined by using a variety of metacharacters and operators to create larger expressions.

也就是，使用各种中继字元及运算子结合小型运算式来建立较大的运算式。

There are two types of characters that are used in regular expressions: metacharacters and normal characters.

正则表达式中使用以下两种类型的字符：元字符和常规字符。

Setting up crontab entries requires a string with escaped shell metacharacters, so it is best done with simple commands and parameters.

设置crontab条目需要一个包含转义的shell元字符的字符串，所以适合于简单的命令和参数。

The following table describes the metacharacters that affect matching.

下表描述了影响匹配的元字符。

Metacharacters are not active inside classes.

元字符在类别里并不起作用。

A string of characters with any metacharacters converted to their escaped form.

包含任何已转换为转义形式的元字符的字符串。

There are some metacharacters that we haven't covered yet. Most of them will be covered in this section.

还有一些我们还没展示的元字符，其中的大部分将在本节展示。

It's also used to escape all the metacharacters so you can still match them in patterns;

它也可以用于取消所有的元字符，这样你就可以在模式中匹配它们了。

The following table contains the complete list of metacharacters and their behavior in the context of regular expressions

下表包含了元字符的完整列表以及它们在正则表达式上下文中的行为

You can override the capture by using the non-capturing metacharacters? : ,

可以通过使用非捕获元字符？：、？