R从字符串中删除非字母数字符号

Question

我有一个字符串,我想删除所有非字母数字符号,然后放入一个矢量.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()但找不到匹配的例子.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"  

Answer 2

处理这个问题的另一种方法

library(stringr)
text =  c("This is a string.  In addition, this is a string!")
str_split(str_squish((str_replace_all(text, regex("\\W+"), " "))), " ")
#[1] "This"     "is"       "a"        "string"   "In"       "addition" "this"     "is"       "a"        "string"  

• str_replace_all(text, regex("\\W+"), " ")：查找非单词字符并替换" "
• str_squish()：减少字符串内重复的空格
• str_split()：将字符串分成几部分