stringr extract full number from string

Question

From ?stringr::str_extract, I tried

 library(stringr)
 str_extract(\"number 123\", \"\\\\d\")
 # [1] \"1\"

but I\'d like the f

Answer 1

For this particular example, the following regular expression works:

pat <- "(\\d)+"
as.numeric(str_extract("number 123", pat))
# [1] 123

If you want to only pick out numbers that terminate the text string that they are in, add a $ to the end of the pattern above.