每5个字符拆分一个字符串

Suppose I have a long string:

假设我有一个长字符串：

"XOVEWVJIEWNIGOIWENVOIWEWVWEW"

How do I split this to get every 5 characters followed by a space?

如何分割这个以获得每5个字符后跟一个空格？

"XOVEW VJIEW NIGOI WENVO IWEWV WEW"

Note that the last one is shorter.

请注意，最后一个更短。

I can do a loop where I constantly count and build a new string character by character but surely there must be something better no?

我可以做一个循环，我不断计算并按字符构建一个新的字符串字符，但肯定必须有更好的东西吗？

5 个解决方案

#1

Using regular expressions:

使用正则表达式：

gsub("(.{5})", "\\1 ", "XOVEWVJIEWNIGOIWENVOIWEWVWEW")
# [1] "XOVEW VJIEW NIGOI WENVO IWEWV WEW"

#2

Using sapply

使用sapply

> string <- "XOVEWVJIEWNIGOIWENVOIWEWVWEW"
> sapply(seq(from=1, to=nchar(string), by=5), function(i) substr(string, i, i+4))
[1] "XOVEW" "VJIEW" "NIGOI" "WENVO" "IWEWV" "WEW"

#3

You can try something like the following:

您可以尝试以下内容：

s <- "XOVEWVJIEWNIGOIWENVOIWEWVWEW" # Original string
l <- seq(from=5, to=nchar(s), by=5) # Calculate the location where to chop

# Add sentinels 0 (beginning of string) and nchar(s) (end of string)
# and take substrings. (Thanks to @flodel for the condense expression)
mapply(substr, list(s), c(0, l) + 1, c(l, nchar(s)))

Output:

输出：

[1] "XOVEW" "VJIEW" "NIGOI" "WENVO" "IWEWV" "WEW"

Now you can paste the resulting vector (with collapse=' ') to obtain a single string with spaces.

现在，您可以粘贴生成的向量（使用collapse =''）以获取带空格的单个字符串。

#4

You can also use a sub-string without a loop. substring is the vectorized substr

您也可以使用没有循环的子字符串。 substring是向量化的substr

x <- "XOVEWVJIEWNIGOIWENVOIWEWVWEW"
n <- seq(1, nc <- nchar(x), by = 5) 
paste(substring(x, n, c(n[-1]-1, nc)), collapse = " ")
# [1] "XOVEW VJIEW NIGOI WENVO IWEWV WEW"

#5

No *apply stringi solution:

否*应用stringi解决方案：

x <- "XOVEWVJIEWNIGOIWENVOIWEWVWEW"
stri_sub(x, seq(1, stri_length(x),by=5), length=5)
[1] "XOVEW" "VJIEW" "NIGOI" "WENVO" "IWEWV" "WEW"

This extracts substrings just like in @Jilber answer, but stri_sub function is vectorized se we don't need to use *apply here.

这提取子串就像在@Jilber中一样，但是stri_sub函数是矢量化的，我们不需要使用* apply here。

#1