This function facilitates matching by providing negative assurances for surrounding symbols/groups of symbols. It allows for building expressions that are dependent on context of occurrence.

rx_avoid_prefix(.data = NULL, value)

rx_avoid_suffix(.data = NULL, value)



Expression to append, typically pulled from the pipe %>%


Exact expression to match


# matches any number of digits, but not preceded by "USD" rx() %>% rx_avoid_prefix('USD') %>% rx_digit() %>% rx_one_or_more()
#> [1] "(?<!USD)\\d+"
#matches a digit, but not followed by " dollars" rx() %>% rx_digit() %>% rx_avoid_suffix(' dollars')
#> [1] "\\d(?! dollars)"