Examples

Extract all words after a specific tag

In this example, we want to extract every word that comes after a @, including the @. To do this, we will:

string <- "nowy commit, nowa przygoda @OSKI @data2 @pankote testujemy kod @oski2"

x <- rx() %>% 
  rx_find(value = "@") %>% 
  rx_alnum() %>% 
  rx_one_or_more()

# base R approach
unlist(regmatches(string, gregexpr(x, string)))
#> [1] "@OSKI"    "@data2"   "@pankote" "@oski2"

# stringr approach
# stringr::str_extract_all(string, x)

1. First, construct the verbal expression with rx
2. Then, rx_find the @ tag
3. Then, match all alphanumeric characters
4. Then, match one_or_more characters in the range

Source: https://stackoverflow.com/questions/31105862