How do you extract numbers from a string in R language?

In R language, regular expressions can be used to extract numbers from strings. There are two specific methods to achieve this.

1. extracts substrings from a string.

library(stringr)
string <- "Hello123World456"
numbers <- str_extract(string, "\\d+")

In the above code, the function str_extract() is used to extract numbers from a string. The regular expression \\d+ matches consecutive numeric characters.

1. retrieve all occurrences of a pattern

library(stringr)
string <- "Hello123World456"
numbers <- unlist(str_extract_all(string, "\\d+"))

In the above code, the function str_extract_all() is used to extract all numbers in a string. The function unlist() is used to convert the extraction results into a vector.

Regardless of the method used, you can eventually view the extracted numbers by printing the numbers variable.