listing the files in a directory using regular expressions

Hi Experts,
  
  This might be silly question that I am asking, but no way as I am new to
R.
I want to list the files in a directory using regular expression like
A_B*_C*.csv  etc.
How to make this possible in R ?
I tried like this list.files(dir=".", pattern="A_B*_C*.csv") but this gives
no output, whereas list.files(.... pattern="*.csv") giving all the .csv
files in the output, which I do not want.

Thanks
Sidda
   



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