fork download
copy 
  1. tests = c(
  2.    "dog cat",
  3.    "dogs and cats",
  4.    "dog and cat", 
  5.    "dog and fluffy cats",
  6.    "cats and dogs", 
  7.    "cat and dog",  
  8.    "fluffy cats and fluffy dogs")  
  9. neg_pattern = "^(?!.*dog.*cat).*cat"
  10. grep(neg_pattern, tests, perl = TRUE, value = TRUE)
Success #stdin #stdout 0.29s 175424KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
[1] "cats and dogs"               "cat and dog"                
[3] "fluffy cats and fluffy dogs"
https://ideone.com/v6mpjt
language:
R (R 3.5.2)
created:
7 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!