Capturing parts of string using regular expression in R

Question

I have these strings:

myseq <- c(\"ALM_GSK_LN_06.ID\",\"AS04_LV_06.ID.png\",\"AS04_SP_06.IP.png\")

What I want to do is to capture parts of

Answer 1

You are pretty close. Here is a small adjustment:

str_match(myseq, "(.+)_(LN|LV|SP)_06\\.([A-Z]+)")[, -1]

produces:

     [,1]      [,2] [,3]
[1,] "ALM_GSK" "LN" "ID"
[2,] "AS04"    "LV" "ID"
[3,] "AS04"    "SP" "IP"

Yours doesn't work because your first token matches neither numbers or underscores, which you need for "AS04" (numbers) and "ALM_GSK" (underscores).