删除R中单词开头的特殊字符 [英] Removing special characters in the beginning of a word in R

问题描述

我正在使用以下代码从单词开头删除特殊字符:

I am using the following code to remove the special characters from the begining of a word:

>gsub("^[^[:alnum:]]",'','#C++')
[1] "C++"

但是如果开始时有多个特殊字符，它将仅删除第一个特殊字符:

But If there are multiple special characters in the beggining it removes only the first one:

>gsub("^[^[:alnum:]]",'','$#C++')
[1] "#C++"

如何使开头的所有特殊字符都删除，所以输出应为"C++"?

How can I make it to remove all the special characters in the begining so the output should be "C++"?

推荐答案

我们从字符串(^)的开头匹配一个或多个非字母数字字符([^[:alnum:]]+)，并将其替换为''

We match one or more non-alpha numeric characters ([^[:alnum:]]+) from the beginning of the string (^) and replace it with ''.

 sub("^[^[:alnum:]]+",'','$#C++')

或使用

 sub("^\\W+",'','$#C++')
 #[1] "C++"

这篇关于删除R中单词开头的特殊字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！