Scala code typically uses Java classes for dealing with I/O, including reading directories. So you have to do something like:
import java.io.File
def recursiveListFiles(f: File): Array[File] = {
val these = f.listFiles
these ++ these.filter(_.isDirectory).flatMap(recursiveListFiles)
}
You could collect all the files and then filter using a regex:
myBigFileArray.filter(f => """.*.html$""".r.findFirstIn(f.getName).isDefined)
Or you could incorporate the regex into the recursive search:
import scala.util.matching.Regex
def recursiveListFiles(f: File, r: Regex): Array[File] = {
val these = f.listFiles
val good = these.filter(f => r.findFirstIn(f.getName).isDefined)
good ++ these.filter(_.isDirectory).flatMap(recursiveListFiles(_,r))
}
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