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R list files with multiple conditions

I want to list all files in a directory that met certain conditions (date and currency). So with only one condition the argument pattern in list.files works well:

    file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern='20130801')

For multiple conditions I've tried:

    file.ls <- list.files(path='~/DATA/PiP/Curvas/',pattern=c('20130801','USD'))

But had the same result as the first one. Is there a way to have multiple criteria in pattern argument of list.files?

Solution 
  •  Filter(function(x) grepl("USD", x), file.ls)

    alternatively, you could construct a regular expression for pattern that only matches filenames containing both strings, but that's a wizard's game.