问题描述
这些表达是什么意思?我在哪里可以了解它们的用法?
What do these expressions mean? Where can I learn about their usage?
\\d
\\D
\\s
\\S
\\w
\\W
\\t
\\n
^
$
\
| etc..
我需要使用stringr软件包，我完全不知道如何使用它们.
I need to use the stringr package and i have absolutely no idea how to use these .
推荐答案
在扩展正则表达式部分的?regexp中:
从类似Perl的正则表达式:
请注意，反斜杠通常需要在R输入中加倍/保护，例如您将使用"\\h"来匹配水平空间.
Note that backslashes usually need to be doubled/protected in R input, e.g. you would use "\\h" to match horizontal space.
来自?Quotes:
正如上面的其他评论所述，如果您是第一次开始使用正则表达式，则可能需要更多帮助.对于StackOverflow(链接到场外资源)来说，这有点偏离主题，但是 gsubfn软件包概述.还是Google的正则表达式教程" ...
As others comment above, you may need a little more help if you're getting started with regular expressions for the first time. This is a little bit off-topic for StackOverflow (links to off-site resources), but there are some links to regular expression resources at the bottom of the gsubfn package overview. Or Google "regular expression tutorial" ...
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