How do I split a string by r into a delimiter and discard the last two elements?

Question

How do I split a string by r into a delimiter and discard the last two elements?

I have a string split _

and I want to get rid of the last two items. For example, from A_B_C_D

I want to return A_B

, and from A_B_C_D_E

I want A_B_C

. I tried str_split_fixed

from stringr

:

my_string <- "A_B_C_D"
x <- str_split_fixed(my_string,"_",3)

but it returns "A" "B" "C_D"

instead "A_B" "C" "D"

, otherwise I could do head(x,-2)

to getA_B

Is there a better way than

paste(head(unlist(strsplit(my_string,"_")),-2),collapse="_")

+3

r stringr

nachocab 01 Feb At 15:08

source to share

1 answer

Justin · Accepted Answer · 2013-02-01T15:13:09+0000

How to use regex:

sub('(_[A-Z]){2}$', '', 'A_B_C_D')

Where number 2

is the length you want to remove.

How do I split a string by r into a delimiter and discard the last two elements?

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