regex - R从字符串中删除非字母数字符号

Question

我有一个字符串，我想从中删除所有非字母数字符号，然后放入向量中。所以这：

"This is a string.  In addition, this is a string!" 

会成为：

>stringVector1

"This","is","a","string","In","addition","this","is","a","string"

我看过 grep()，但找不到匹配的示例。有什么建议？

Answer 1

这是一个例子：

> 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"