Another regex problem I can't solve. :/
I have the following input vector:
x <- c("test", paste0(rep(paste0("Q18r", c(1:14, 997)), each = 2), c("c1", "c2")))
I now want to do the following match:
The problem is that I can't figure out how to add the "c1" at the end, ie I get it working at least for the first two matches with:
stringr::str_subset(x, "Q18r(?=[1-3]|1[1-2])|(997)")
I tried a lot of different c1 matches, ie (?=c1)
, only c1
, (c1)
etc. but nothing works.
Any ideas?
You can use
stringr::str_subset(x, "Q18r(?:[1-3]|1[1-2]|997)c1")
[1] "Q18r1c1" "Q18r2c1" "Q18r3c1" "Q18r11c1" "Q18r12c1" "Q18r997c1"
Regex details :
Q18r
- a fixed Q18r
string (?:[1-3]|1[1-2]|997)
- a non-capturing group matching 1
, 2
, 3
, 11
, 12
or 997
c1
- a c1
string.
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