R 获取给定字符串中的子字符串位置

考虑字符串：

a <- "this is a string"

但似乎没有给出位置

是否有一个函数可以告诉我任何子字符串的位置

getLoction(a, "t")
## 1 12

getLoction(a, "this")
## 1

---

给你，我偏爱stringr软件包：

library(stringr)
a <- "this is a string"
str_locate(a,"t")
str_locate(a,"this")
str_locate_all(a,"t")

library(stringr)
a <- "this is a string"
str_locate(a,"t")
str_locate(a,"this")
str_locate_all(a,"t")

> str_locate(a,"t")
     start end
[1,]     1   1
> str_locate(a,"this")
     start end
[1,]     1   4
> str_locate_all(a,"t")
[[1]]
     start end
[1,]     1   1
[2,]    12  12