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I am using grepl() in R to search if either of the following genres exist in my text. I am doing it like this right now:
grepl("Action", my_text) |
grepl("Adventure", my_text) |
grepl("Animation", my_text) |
grepl("Biography", my_text) |
grepl("Comedy", my_text) |
grepl("Crime", my_text) |
grepl("Documentary", my_text) |
grepl("Drama", my_text) |
grepl("Family", my_text) |
grepl("Fantasy", my_text) |
grepl("Film-Noir", my_text) |
grepl("History", my_text) |
grepl("Horror", my_text) |
grepl("Music", my_text) |
grepl("Musical", my_text) |
grepl("Mystery", my_text) |
grepl("Romance", my_text) |
grepl("Sci-Fi", my_text) |
grepl("Sport", my_text) |
grepl("Thriller", my_text) |
grepl("War", my_text) |
grepl("Western", my_text)
Is there a better way to write this code? Can I put all the genres in an array and then somehow use grepl() on that?
649
If you want to find exact matches for multiple patterns, pass the -w flag to the grep command. As you can see, the results are different. The first command shows all lines with the strings you used. The second command shows how to grep exact matches for multiple strings.
Both functions allow you to see whether a certain pattern exists in a character string, but they return different results: grepl() returns TRUE when a pattern exists in a character string. grep() returns a vector of indices of the character strings that contain the pattern.
The grepl() stands for “grep logical”. In R it is a built-in function that searches for matches of a string or string vector. The grepl() method takes a pattern and data and returns TRUE if a string contains the pattern, otherwise FALSE.
You could paste the genres together with an "or" | separator and run that through grepl as a single regular expression.
x <- c("Action", "Adventure", "Animation", ...)
grepl(paste(x, collapse = "|"), my_text)
Here's an example.
x <- c("Action", "Adventure", "Animation")
my_text <- c("This one has Animation.", "This has none.", "Here is Adventure.")
grepl(paste(x, collapse = "|"), my_text)
# [1] TRUE FALSE TRUE
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