Wsrtjtyk

I want to extract all numbers after string "mystr" and something else. For example if I have string.

x <- "This is mystring hola 8 and this yourstring hola 9 and again mystrings op 12."

It should return 8 and 12.
In R I tried:

stringr::str_extract_all(x, "mystr.*\d+")

You may extract the closest digit chunks after mystr using

x <- "This is mystring hola 8 and this yourstring hola 9 and again mystrings op 12."

regmatches(x, gregexpr("mystr.*?\K\d+", x, perl=TRUE))

# => [[1]]

#    [1] "8"  "12"

See the R demo

This PCRE regex will match

• 
  mystr - mystr
  


• 
  .*? - any 0+ chars other than line break chars as few as possible


• 
  \K - will omit the text matched so far


• 
  \d+ - 1+ digits.

See the PCRE regex demo.

If you want to use stringr, you may use str_match_all:

> library(stringr)

> x <- "This is mystring hola 8 and this yourstring hola 9 and again mystrings op 12."

> str_match_all(x, "mystr.*?(\d+)")[[1]][,2]

[1] "8"  "12"

were the digits are captured into Group 1.

Sometimes str_match is more flexible than str_extract:

library(stringr)

str_match_all("This is mystring hola 8 and this yourstring hola 9 and again mystrings op 12.", 

              "mystring.*?(\d+)")[[1]][, 2]



[1] "8"  "12"