CODEWITHSUNDEEP
rstringr
userJT
userJT

Reputation: 11934

How to ignore case when using str_detect?

stringr package provides good string functions.

To search for a string (ignoring case)

one could use

stringr::str_detect('TOYOTA subaru',ignore.case('toyota'))

This works but gives warning

Please use (fixed|coll|regex)(x, ignore_case = TRUE) instead of ignore.case(x)

What is the right way of rewriting it?

Upvotes: 60

Views: 46290

Answers (5)

Unrelated
Unrelated

Reputation: 457

Or you can erase all capitalization while you search:

str_detect(tolower('TOYOTA subaru'), 'toyota')

Upvotes: 3

akuiper
akuiper

Reputation: 214927

You can use regex (or fixed as suggested in @lmo's comment depending on what you need) function to make the pattern as detailed in ?modifiers or ?str_detect (see the instruction for pattern parameter):

library(stringr)
str_detect('TOYOTA subaru', regex('toyota', ignore_case = T))
# [1] TRUE

Upvotes: 68

David T
David T

Reputation: 2143

You can save a little typing with (?i):

c("Toyota", "my TOYOTA", "your Subaru") %>% 
  str_detect( "(?i)toyota" )
# [1]  TRUE  TRUE FALSE

Upvotes: 51

Sam Firke
Sam Firke

Reputation: 23014

You can use the base R function grepl() to accomplish the same thing without a nested function. It simply accepts ignore.case as an argument.

grepl("toyota", 'TOYOTA subaru', ignore.case = TRUE)

(Note that the order of the first two arguments (pattern and string) are switched between grepl and str_detect).

Upvotes: 8

userJT
userJT

Reputation: 11934

the search string must be inside function fixed and that function has valid parameter ignore_case

str_detect('TOYOTA subaru', fixed('toyota', ignore_case=TRUE))

Upvotes: 31

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