r string find and replace

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12 Jun 2019

1# NOT RUN {
2fruits <- c("one apple", "two pears", "three bananas")
3str_replace(fruits, "[aeiou]", "-")
4str_replace_all(fruits, "[aeiou]", "-")
5str_replace_all(fruits, "[aeiou]", toupper)
6str_replace_all(fruits, "b", NA_character_)
7
8str_replace(fruits, "([aeiou])", "")
9str_replace(fruits, "([aeiou])", "\\1\\1")
10str_replace(fruits, "[aeiou]", c("1", "2", "3"))
11str_replace(fruits, c("a", "e", "i"), "-")
12
13# If you want to apply multiple patterns and replacements to the same
14# string, pass a named vector to pattern.
15fruits %>%
16  str_c(collapse = "---") %>%
17  str_replace_all(c("one" = "1", "two" = "2", "three" = "3"))
18
19# Use a function for more sophisticated replacement. This example
20# replaces colour names with their hex values.
21colours <- str_c("\\b", colors(), "\\b", collapse="|")
22col2hex <- function(col) {
23  rgb <- col2rgb(col)
24  rgb(rgb["red", ], rgb["green", ], rgb["blue", ], max = 255)
25}
26
27x <- c(
28  "Roses are red, violets are blue",
29  "My favourite colour is green"
30)
31str_replace_all(x, colours, col2hex)
32# }
33

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