fork download 
  1. vec <- c("19980213", "19980214", "19980215", "19980216","19980217", "iffi","geometry", "date_consid")
  2. grep("^(\\d{8}|date_consid)$", vec, value=TRUE, invert=TRUE)
Success #stdin #stdout 0.27s 38984KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "iffi"     "geometry"
https://ideone.com/a5N9S2
language:
R (R 3.5.2)
created:
4 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!