Question

我有一个字符串：

words<-"Monday, Tuesday, Wednesday, Thursday,Friday"

我只需要为每个单词添加引号：

"Monday", "Tuesday", "Wednesday", "Thursday","Friday"

获得五个字符串的长度。

我知道有很多关于这个主题的帖子，但我在R中找不到任何关于它的内容。

非常感谢。

Answer 1

我们可以按,分割单词以获得list输出。我们遍历sapply，dQuote元素，然后将paste与toString一起循环，paste(..., collapse=', ')是sapply(strsplit(words, '[, ]+'), function(x) toString(dQuote(x))) #[1] "“Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”"的包装。

public static <T, R> Predicate<T> isNull(Function<T, R> mapper) {
        return new Predicate<T> {
            @Override
            boolean test(T o) {
               return ObjectPredicate.IS_NULL.callback().test(mapper.apply(o));
            }
        }
}

Answer 2

使用gsub

words<-"Monday, Tuesday, Wednesday, Thursday,Friday"
cat(gsub("(\\w+)", '"\\1"', words))
# "Monday", "Tuesday", "Wednesday", "Thursday","Friday"

... KISS

cat(gsub("\\b", '"', words, perl=T))
#"Monday", "Tuesday", "Wednesday", "Thursday","Friday"

\\b称为单词边界，它在单词字符（ AZ，az，_，0-9 ）和非单词字符（不是A-Za-z0-）之间匹配9_）或反之亦然..

Answer 3

strsplit用逗号分割字符串，sub删除空格。

paste(dQuote(sub(" ","",unlist(strsplit(words,split = ",")))),collapse = ", ")

[1] "“Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”"

如何在R中的字符串中的每个单词周围添加引号？

3 个答案: