Filter by multiple patterns with filter() and str_detect()

问题:

I would like to filter a dataframe using filter() and str_detect() matching for multiple patterns without multiple str_detect() function calls. In the example below I would like to filter the dataframe df to show only rows containing the letters a f and o.

df <- data.frame(numbers = 1:52, letters = letters) df %>%     filter(         str_detect(.$letters, "a")|         str_detect(.$letters, "f")|          str_detect(.$letters, "o")     ) #  numbers letters #1       1       a #2       6       f #3      15       o #4      27       a #5      32       f #6      41       o

I have attempted the following

df %>%     filter(         str_detect(.$letters, c("a", "f", "o"))      ) #  numbers letters #1       1       a #2      15       o #3      32       f

and receive the following error

Warning message: In stri_detect_regex(string, pattern, opts_regex = opts(pattern)) : longer object length is not a multiple of shorter object length

回答1:

The correct syntax to accomplish this with filter() and str_detect() would be

df %>%   filter(       str_detect(letters, "a|f|o")   ) #  numbers letters #1       1       a #2       6       f #3      15       o #4      27       a #5      32       f #6      41       o

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