bash [:space:] 和 [:blank:] 有什么区别？
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What's the difference between [:space:] and [:blank:]?
提问by Julien Grenier
From the A Brief Introduction to Regular Expressions
[:blank:] matches a space or a tab.
[:blank:] 匹配空格或制表符。
[:space:] matches whitespace characters (space and horizontal tab).
[:space:] 匹配空白字符（空格和水平制表符）。
To me both definitions are the same and I was wondering if they are really duplicates?
对我来说，这两个定义是相同的，我想知道它们是否真的重复？
If they are different, what are the differences?
如果它们不同，它们的区别是什么？
回答by Thor
For the GNU tools the following from grep.infoapplies:
对于 GNU 工具，以下内容grep.info适用：
[: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.
You can find the section with this command:
您可以使用以下命令找到该部分：
info grep 'Regular Expressions' 'Character Classes and Bracket Expressions'
回答by JaredPar
A better explanation of what they each match is available here
在这里可以更好地解释他们每场比赛的内容
The biggest difference is that [:space:]will also match items like new line characters
最大的区别是[:space:]还会匹配换行符之类的项目
回答by karthi
A space means to pressing a space bar and tab
空格表示按空格键和制表符
A white space means it carries the newline,tab,form feed and carriage return and also space that's all.
空格意味着它带有换行符、制表符、换页符和回车符以及空格。
