Remove multiple objects with similar names in R

I have a bunch of objects in the R environment, with names as: file_01, file_02, ... etc.

To remove these objects by using just one line of code, here's one solution:

rm(file_01, file_02,...)

However, if the number of files is too large, it is not practical to type in all the file names. Here's a solution to remove these objects, again by using just one line of code:

rm(list=ls(patter='file'))