根据某些字符排序字符串

Question

我有一个字符串向量，每个字符串里面都有一个数字，我想根据这个数字对向量进行排序。

MWE：

> str = paste0('N', sample(c(1,2,5,10,11,20), 6, replace = FALSE), 'someotherstring')
> str
[1] "N11someotherstring" "N5someotherstring"  "N2someotherstring"  "N20someotherstring" "N10someotherstring" "N1someotherstring" 
> sort(str)
[1] "N10someotherstring" "N11someotherstring" "N1someotherstring"  "N20someotherstring" "N2someotherstring"  "N5someotherstring"

而我想拥有

[1] "N1someotherstring"  "N2someotherstring"  "N5someotherstring"  "N10someotherstring" "N11someotherstring" "N20someotherstring"

我曾想过使用类似的东西：

num = sapply(strsplit(str, split = NULL), function(s) {
  as.numeric(paste0(head(s, -15)[-1], collapse = ""))
})
str = str[sort(num, index.return=TRUE)$ix]

但我想可能会更简单

Answer 1

有一个简单的方法可以通过gtools软件包来实现，

gtools::mixedsort(str)
#[1] "N1someotherstring"  "N2someotherstring"  "N5someotherstring"  "N10someotherstring" "N11someotherstring" "N20someotherstring"