How can I use R to remove a file extension that is not alphanumeric extension -

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this example of file name 

mod09a1.a2000049.h19v11.005.2006268194400.hdf.sur_refl_day_of_year

initially 

mod09a1.a2000049.h19v11.005.2006268194400.hdf.sur_refl_day_of_year.tif

i used function file_path_sans_ext remove ".tiff" still want remove ".sur_refl_day_of_year". need file name mod09a1.a2000049.h19v11.005.2006268194400.hdf only.

try:

sub("(\\.hdf).*", "\\1", myfilename)

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