How to drop columns by name pattern in R?

Question

I have this dataframe:

state county city  region  mmatrix  X1 X2 X3    A1     A2     A3      B1     B2     B3      C1      C2      C3

  1      1     1            


        

Answer 1

I found a simple answer using dplyr/tidyverse. If your colnames contain "This", then all variables containing "This" will be dropped.

library(tidyverse) 
df_new <- df %>% select(-contains("This"))