How to extract number from string?

Question

I have

strQuestions <- c("Q1", "Q22")

I need to get

nQuestions <- c(1,22)

How can I do it nicely? (with stringr?). Thank you

@akrun those two posts have pretty different aims: one is about truncating strings, the other is about substituting commonly accepted English abbreviation standards. Neither are relevant on this post. — camille, May 08 '19 at 17:34
@akrun Not my downvote but two hits under the top10 when I google for OP's question title make it a dupe for me. — markus, May 08 '19 at 17:44

score 2 · Accepted Answer · edited May 08 '19 at 17:23

2

With stringr:

str_sub(strQuestions, 2, 3)
stringr::str_remove_all(strQuestions,"[A-Za-z]")

You can add the function as.numeric() after.

edited May 08 '19 at 17:23

NelsonGon

answered May 08 '19 at 17:20

demarsylvain

1 Answers1