R exact match for multiple patterns-CodePudding

I would like to find exact matches for "A1" and "A6" in the vector:

myfile=paste("A",c(1:10),sep="")

I used str_detect from the stringr package:

toMatch <- c("A1", "A6")


str_detect(myfile,fixed(paste(toMatch,collapse="|")))

but it returns TRUE also for partial match with "A10".

Any other funs that could work?

CodePudding user response：

We could use the word boundary (\\b) to avoid the unnecessary partial matches

str_detect(myfile,paste0("\\b(", paste(toMatch, collapse="|"), ")\\b"))
 [1]  TRUE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE

Based on the elements used, it can be done with %in%

myfile %in% toMatch
1]  TRUE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE