R从字符串中删除非字母数字符号
问题描述：
我有一个字符串，我想删除所有非字母数字符号，然后放入一个矢量。所以这个：
I have a string and I want to remove all non-alphanumeric symbols from and then put into a vector. So this:
"This is a string. In addition, this is a string!"
会变成：
would become:
>stringVector1
"This","is","a","string","In","addition","this","is","a","string"
我看过 grep（）但找不到匹配的示例。任何建议？
I've looked at grep() but can't find an example that matches. Any suggestions?
答
这里是一个例子：
here is an example:
> str <- "This is a string. In addition, this is a string!"
> str
[1] "This is a string. In addition, this is a string!"
> strsplit(gsub("[^[:alnum:] ]", "", str), " +")[[1]]
[1] "This" "is" "a" "string" "In" "addition" "this" "is" "a"
[10] "string"