R刪除字符串中的非字母數字符號

Question

我有一個字符串，我想從中刪除所有非字母數字符號，然後放入矢量中。所以這個：

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

將成爲：

>stringVector1 

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

我看了grep()，但無法找到匹配的例子。有什麼建議麼？

Answer 1

這裏有一個例子：

> 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"