str_detect for multiple patterns

Question

I am using str_detect within the stringr package and I am having trouble searching a string with more than one pattern.

Here is the code I am using, however it is not returning anything even though my vector ("Notes-Title") contains these patterns.

filter(str_detect(`Notes-Title`, c("quantity","single")))

The logic I want to code is:

Search each row and filter it if it contains the string "quantity" or "single".

Answer 1

You need to use the | separator in your search, all within one set of "".

> words <- c("quantity", "single", "double", "triple", "awful")
> set.seed(1234)
> df = tibble(col = sample(words,10, replace = TRUE))
> df
# A tibble: 10 x 1
   col     
   <chr>   
 1 triple  
 2 single  
 3 awful   
 4 triple  
 5 quantity
 6 awful   
 7 triple  
 8 single  
 9 single  
10 triple 

> df %>% filter(str_detect(col, "quantity|single"))
# A tibble: 4 x 1
  col     
  <chr>   
1 single  
2 quantity
3 single  
4 single