Test If Characters Are in a String
I'm Trying to Determine If a String Is a Subset of Another String. for Example: Chars Grepl("1+2", "123+456") [1] True Interpretation Grep Is Named After the...
I'm trying to determine if a string is a subset of another string. For example:
chars <- "test"
value <- "es"
I want to return TRUE if "value" appears as part of the string "chars". In the following scenario, I would want to return false:
chars <- "test"
value <- "et"
9 Answers
Use the grepl function
grepl( needle, haystack, fixed = TRUE)
like so:
grepl(value, chars, fixed = TRUE)
# TRUE
Use ?grepl to find out more.
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Answer
Sigh, it took me 45 minutes to find the answer to this simple question. The answer is: grepl(needle, haystack, fixed=TRUE)
# Correct
> grepl("1+2", "1+2", fixed=TRUE)
[1] TRUE
> grepl("1+2", "123+456", fixed=TRUE)
[1] FALSE
# Incorrect
> grepl("1+2", "1+2")
[1] FALSE
> grepl("1+2", "123+456")
[1] TRUE
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
