Read characters with grep

[dario_gd]

I have this character

I would like to use the Grep function, or something like that, to make me return specific parts.
I explain myself. I would like to write a function that would return everything before the first slash "/".
then another line in which is returned what is between the first "/" and the second "/".

to be clear,
it should return,
in the first case "101".
in the second case "Testler Export"

[andresrcs]

I think you want to do something like this

string <- "101/Testler Export/somthing/shomething else.txt"
strsplit(string, "/")[[1]][1:2]
#> [1] "101"            "Testler Export"

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[dario_gd]

sorry, i'm new in this community. i'm a beginner whith R, can you tell me what this command mean

[[1]][1:2]

I understood how to use them, but to understand more fully their meaning. also you could advise me, where I can learn this syntax of R. for example, I refer to the use that you made of square brackets, etc ..
Sorry in advance if I made mistakes on how to publish on the site

[andresrcs]

Those commands are for subsetting lists and vectors, this section of the free online book "R Programming for Data Science" explains this very well.

9 Subsetting R Objects | R Programming for Data Science

[Yarnabrina]

strsplit(string, '/') returns a list, of the same length as string itself (in this case 1).

So, here [[1]] returns the first element of that list, which is a vector c( '101', 'Testler Export', 'somthing', 'shomething else.txt')

Finally, [1:2] returns the first two elements of that vector, i.e. c('101', 'Testler Export').

string <- '101/Testler Export/somthing/shomething else.txt'

(split <- strsplit(x = string,
                  split = '/'))
#> [[1]]
#> [1] "101"                 "Testler Export"      "somthing"           
#> [4] "shomething else.txt"

(split_1 <- split[[1]])
#> [1] "101"                 "Testler Export"      "somthing"           
#> [4] "shomething else.txt"

(split_1_1n2 <- split_1[1:2])
#> [1] "101"            "Testler Export"