How to extract multiple substrings in a string using stringr regex

Question

I have this string:

mystring <- "HMSC-bm_in_ALL_CELLTYPES.distal"

What I want to do is to extract the substring as defined in this bracketing

[HMSC-bm]_in_ALL_CELLTYPES.[distal]

So in the end it will yield a vector with two values: HMSC-bm and distal. How can I do it? I tried this but failed:

> stringr::str_extract(base,"\\([\\w-]+\\)_in_ALL_CELLTYPES\\.\\([\\w+]\\)")
[1] NA

score 3 · Answer 1 · answered Oct 25 '17 at 00:36

I'd use str_match:

library(stringr)
mymatch <- str_match(mystring, "^(.*?)_.*?\\.(.*?)$")
mymatch

     [,1]                              [,2]      [,3]    
[1,] "HMSC-bm_in_ALL_CELLTYPES.distal" "HMSC-bm" "distal"

mymatch[, 2]
[1] "HMSC-bm"

mymatch[3, ]
[1] "distal"

score 2 · Answer 2 · answered Oct 25 '17 at 00:55

2

We can split the string by _in_ALL_CELLTYPES..

strsplit(mystring, split = "_in_ALL_CELLTYPES.")[[1]]
[1] "HMSC-bm" "distal"

answered Oct 25 '17 at 00:55

www

38,575
12
48
84

How to extract multiple substrings in a string using stringr regex

2 Answers2