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 <- find(value = "@") %>% 
  range(c("a", "z", 0, 9)) %>% 
  one_or_more() %>% 
  with_any_case()

x
#> [1] "(?i)(?:@)[a-z0-9]+"

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

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

1. First, find the @ tag
2. Second, match a range of characters, a through z and 0 through 9
3. Third, match one_or_more characters in the range
4. Fourth, match with_any_case thereby enabling case insensitive matching

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