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perldoc -f opendir
perldoc -f readdirI'm not sure I follow your question but you can use the above to to read through directories and thus select your file.
something like the following may suit...

@hemasid: I think the solution provided by Skrynesaver in post #2 fits your question. If not, what is it that you're exactly looking for?

if (($dir=~/latest/) && ( -d "$base/$dir")) --> This line...