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str_extract all using mutate and toString
library(purrr)
d %>%
mutate(y = str_extract_all(x, "\\b\\d{2}\\b") %>%
map_chr(toString))
# A tibble: 3 x 2
# x y
# <chr> <chr>
#1 i am 10 and she is 50 10, 50
#2 he is 32 and i am 22 32, 22
#3 he may be 70 and she may be 99 70, 99
Source: stackoverflow.com
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