rx_one_or_more: Match the previous stuff one or more times.
In RVerbalExpressions: Create Regular Expressions Easily

This function simply adds a + to the end of the expression.

1	rx_one_or_more(.data = NULL, mode = "greedy")

`.data`	Expression to append, typically pulled from the pipe `%>%`
`mode`	Matching mode (`greedy` (default) or`lazy`). `Lazy` matching stops after the first match, `greedy` continues searching until end of the string and then back-tracks to the last match.

rx_one_or_more()

# create an expression
x <- rx() %>%
  rx_find("a") %>%
  rx_one_or_more()

# create input
input <- "aaa"

# extract match
regmatches(input, regexpr(x, input))