Pattern match in R

I want to make sure this piece of code I wrote is doing what I want it to do.

ll<-function(string)
{
	grep(string,dir(),value=T)
}


subdir = ll("Coverage_[1-9][0-9]$")

I basically wrote a little function that would grab all the files of form
Coverage_[0-99]

The way I wrote it, will it grab Coverage_5 or does it have to have 2
numbers (10-99)?

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