[:space:]和[:blank:]有什么区别? [英] What's the difference between [:space:] and [:blank:]?

问题描述

来自正则表达式简介

[:blank:]匹配空格或制表符.

[:blank:] matches a space or a tab.

[:space:]匹配空白字符(空格和水平制表符).

[:space:] matches whitespace characters (space and horizontal tab).

对我来说，两个定义是相同的，我想知道它们是否真的重复吗?

To me both definitions are the same and I was wondering if they are really duplicates?

如果它们不同，有什么区别?

If they are different, what are the differences?

推荐答案

对于GNU工具，grep.info中的以下内容适用:

For the GNU tools the following from grep.info applies:

[:blank:]

     Blank characters: space and tab.

[:space:]

     Space characters: in the 'C' locale, this is tab, newline,
     vertical tab, form feed, carriage return, and space.

您可以使用以下命令找到该部分:

You can find the section with this command:

info grep 'Regular Expressions' 'Character Classes and Bracket Expressions'

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